* @babel/cli                   ^7.15.4  →  ^7.15.7
* @rollup/plugin-node-resolve  ^13.0.4  →  ^13.0.5
* autoprefixer                 ^10.3.4  →  ^10.3.6
* glob                          ^7.1.7  →   ^7.2.0
* nodemon                      ^2.0.12  →  ^2.0.13
* postcss                       ^8.3.6  →   ^8.3.8
* postcss-cli                   ^8.3.1  →   ^9.0.0
* qunit                        ^2.17.1  →  ^2.17.2
* rollup                       ^2.56.3  →  ^2.57.0

* @babel/cli                   ^7.14.8  →  ^7.15.5
* @babel/core                  ^7.14.8  →  ^7.15.4
* @babel/preset-env            ^7.14.8  →  ^7.15.6
* @rollup/plugin-commonjs      ^19.0.1  →  ^20.0.0
* @rollup/plugin-node-resolve  ^13.0.2  →  ^13.0.4
* autoprefixer                 ^10.3.1  →  ^10.3.4
* clean-css-cli                 ^5.3.0  →   ^5.3.3
* eslint                       ^7.31.0  →  ^7.32.0
* eslint-config-xo             ^0.37.0  →  ^0.38.0
* eslint-plugin-import         ^2.23.4  →  ^2.24.2
* eslint-plugin-unicorn        ^34.0.1  →  ^36.0.0
* hugo-bin                     ^0.74.0  →  ^0.76.1
* qunit                        ^2.16.0  →  ^2.17.1
* postcss                       ^8.3.5  →   ^8.3.6
* rollup                       ^2.53.3  →  ^2.56.3
* vnu-jar                      21.6.11  →   21.9.2

* @babel/cli                       ^7.14.3  →  ^7.14.8
* @babel/core                      ^7.14.3  →  ^7.14.8
* @babel/preset-env                ^7.14.2  →  ^7.14.8
* @rollup/plugin-commonjs          ^19.0.0  →  ^19.0.1
* @rollup/plugin-node-resolve      ^13.0.0  →  ^13.0.2
* autoprefixer                     ^10.2.5  →  ^10.3.1
* eslint                           ^7.26.0  →  ^7.31.0
* eslint-config-xo                 ^0.36.0  →  ^0.37.0
* eslint-plugin-import             ^2.23.2  →  ^2.23.4
* eslint-plugin-unicorn            ^31.0.0  →  ^34.0.1
* globby                           ^11.0.3  →  ^11.0.4
* hugo-bin                         ^0.71.1  →  ^0.73.0
* karma                             ^6.3.2  →   ^6.3.4
* karma-firefox-launcher            ^2.1.0  →   ^2.1.1
* linkinator                       ^2.13.6  →  ^2.14.0
* nodemon                           ^2.0.7  →   ^2.0.12
* node-sass                         ^6.0.0  →   ^6.0.1
* postcss                  ...

* @babel/cli                       ^7.13.14  →   ^7.14.3
* @babel/core                       ^7.14.0  →   ^7.14.3
* @babel/preset-env                 ^7.14.1  →   ^7.14.2
* @rollup/plugin-commonjs           ^18.0.0  →   ^19.0.0
* @rollup/plugin-node-resolve       ^11.2.1  →   ^13.0.0
* clean-css-cli                      ^5.2.2  →    ^5.3.0
* eslint                            ^7.23.0  →   ^7.26.0
* eslint-config-xo                  ^0.35.0  →   ^0.36.0
* eslint-plugin-import              ^2.22.1  →   ^2.23.2
* eslint-plugin-unicorn             ^29.0.0  →   ^31.0.0
* glob                               ^7.1.6  →    ^7.1.7
* hugo-bin                          ^0.70.0  →   ^0.71.1
* node-sass                          ^5.0.0  →    ^6.0.0
* postcss                            ^8.2.9  →    ^8.3.0
* qunit                             ^2.14.1  →   ^2.15.0
* rollup                            ^2.44.0  →   ^2.48.0
* stylelint                        ^13.12.0  →  ^13.13.1
* stylelint-config-twbs-bootstrap    ^2.1.0  →    ^2.2.0
* vnu-jar                            21.2.5  →    21.4.9

* @babel/cli                    ^7.13.0  →  ^7.13.14
* @babel/core                   ^7.13.8  →  ^7.13.14
* @babel/preset-env             ^7.13.9  →  ^7.13.12
* @rollup/plugin-commonjs       ^17.1.0  →   ^18.0.0
* @rollup/plugin-node-resolve   ^11.2.0  →   ^11.2.1
* autoprefixer                  ^10.2.4  →   ^10.2.5
* clean-css-cli                 ^5.2.0  →    ^5.2.2
* eslint                        ^7.21.0  →   ^7.23.0
* eslint-plugin-unicorn         ^28.0.2  →   ^29.0.0
* globby                        ^11.0.2  →   ^11.0.3
* hugo-bin                      ^0.69.0  →   ^0.70.0
* karma                         ^6.1.1  →    ^6.3.2
* postcss                       ^8.2.6  →    ^8.2.9
* qunit                         ^2.14.0  →   ^2.14.1
* rollup                        ^2.40.0  →   ^2.44.0
* stylelint                     ^13.11.0  →  ^13.12.0

Also lock jQuery to v3.5.1 since 3.6.0 has a bug that affects at least our tests

* switch to async/await
* remove shelljs
* switch to globby; supports .gitignore out of the box
* don't write any files to the disk if they are indentical
* add two more cmd switches: --dry and --verbose
* strip leading "v" from version arguments so that we don't end up with duplicate `v`s

* @babel/cli             ^7.12.16  →   ^7.13.0
* @babel/core            ^7.12.16  →   ^7.13.8
* @babel/preset-env      ^7.12.16  →   ^7.13.9
* eslint                  ^7.20.0  →   ^7.21.0
* eslint-config-xo        ^0.34.0  →   ^0.35.0
* eslint-plugin-unicorn   ^28.0.1  →   ^28.0.2
* hugo-bin                ^0.68.0  →   ^0.69.0
* linkinator              ^2.13.4  →   ^2.13.6
* lockfile-lint            ^4.3.7  →    ^4.6.2
* rollup                  ^2.39.0  →   ^2.40.0
* stylelint              ^13.10.0  →  ^13.11.0

* Update clean-css-cli to v5.2.0

* Enable clean-css's batch flag

* @babel/cli                   ^7.12.13  →  ^7.12.16
* @babel/core                  ^7.12.13  →  ^7.12.16
* @babel/preset-env            ^7.12.13  →  ^7.12.16
* @rollup/plugin-babel           ^5.2.3  →    ^5.3.0
* @rollup/plugin-node-resolve   ^11.1.1  →   ^11.2.0
* eslint                        ^7.19.0  →   ^7.20.0
* eslint-plugin-unicorn         ^27.0.0  →   ^28.0.1
* karma                          ^6.0.4  →    ^6.1.1
* postcss                        ^8.2.5  →    ^8.2.6
* rollup                        ^2.38.5  →   ^2.39.0
* stylelint                     ^13.9.0  →  ^13.10.0

Kept clean-css-cli to 4.x for the time being.

* @babel/cli                  ^7.12.10  →  ^7.12.13
* @babel/core                 ^7.12.10  →  ^7.12.13
* @babel/preset-env           ^7.12.11  →  ^7.12.13
* @rollup/plugin-babel          ^5.2.2  →    ^5.2.3
* @rollup/plugin-commonjs      ^17.0.0  →   ^17.1.0
* @rollup/plugin-node-resolve  ^11.1.0  →   ^11.1.1
* autoprefixer                 ^10.2.3  →   ^10.2.4
* eslint                       ^7.18.0  →   ^7.19.0
* karma                         ^5.2.3  →    ^6.0.4
* karma-qunit                   ^4.1.1  →    ^4.1.2
* linkinator                    2.11.2  →   ^2.13.4
* postcss                       ^8.2.4  →    ^8.2.5
* rollup                       ^2.38.0  →   ^2.38.5
* vnu-jar                      20.6.30  →    21.2.5

Pin karma and linkinator due to failures

* Bump version to v4.6.0.

* Dist

package.json: move `version_short` variable under the `config` object

This is so that it works on npm 7.x too.

* rename constants
* enforce the constants to be Boolean
* use the coverage plugin only one time, on the latest jQuery run
* fix karma `logLevel`

* @babel/cli                   ^7.12.8  →  ^7.12.10
* @babel/core                  ^7.12.8  →  ^7.12.10
* @babel/preset-env            ^7.12.7  →  ^7.12.11
* @rollup/plugin-babel          ^5.2.1  →    ^5.2.2
* @rollup/plugin-commonjs      ^16.0.0  →   ^17.0.0
* @rollup/plugin-node-resolve  ^10.0.0  →   ^11.0.1
* autoprefixer                 ^10.0.2  →   ^10.2.1
* cross-env                     ^7.0.2  →    ^7.0.3
* eslint                       ^7.14.0  →   ^7.17.0
* eslint-config-xo             ^0.33.1  →   ^0.34.0
* eslint-plugin-unicorn        ^23.0.0  →   ^25.0.1
* find-unused-sass-variables    ^3.0.0  →    ^3.1.0
* hugo-bin                     ^0.66.2  →   ^0.68.0
* linkinator                    ^2.2.2  →   ^2.11.2
* nodemon                       ^2.0.6  →    ^2.0.7
* postcss                      ^8.1.10  →    ^8.2.3
* postcss-cli                   ^8.3.0  →    ^8.3.1
* qunit                        ^2.12.0  →   ^2.13.0
* rollup                 ...

This commit includes all the needed workarounds and most changes from the main branch for everything to work, like:

* removing empty lines in raw HTML that break output
* read .browserslistrc, CSS variables from disk instead of duplicating it
* using Hugo mounts
* using Hugo for the docs CSS/JS
* move ToC Sass code to a separate file while adapting it for Hugo

Thus, this patch makes our npm scripts faster since lint runs on one step and there's no separate docs assets processing.

* autoprefixer                ^9.8.6  →  ^10.0.1
* find-unused-sass-variables  ^2.0.0  →   ^3.0.0
* linkinator                  ^2.2.0  →   ^2.2.2
* postcss-cli                 ^7.1.2  →   ^8.2.0

* Update devDependencies and gems

* Bump bundlewatch limits

* @babel/cli                   ^7.10.4  →  ^7.11.0
* @babel/core                  ^7.10.4  →  ^7.11.0
* @rollup/plugin-babel          ^5.0.4  →   ^5.1.0
* @rollup/plugin-commonjs      ^13.0.0  →  ^14.0.0
* @rollup/plugin-node-resolve   ^8.1.0  →   ^8.4.0
* autoprefixer                  ^9.8.4  →   ^9.8.6
* eslint                        ^7.4.0  →   ^7.6.0
* karma                         ^5.1.0  →   ^5.1.1
* rollup                       ^2.21.0  →  ^2.23.0