Add new icons set - CoreUI Icons

Mention the quotes requirement in the docs too

 Closes #30835 by leaving a comment in the source that the escape-svg() function must have quotes around data URIs.

(cherry picked from commit 849fea5a)

Backport of #31036 to v4

Typo in box-shadow attribute, global variable used instead of local.

Co-authored-by: Arthur Shlain <artur.slain@gmail.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

* Update devDependencies and gems

* Bump bundlewatch limits

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Co-authored-by: Mark Otto <markd.otto@gmail.com>

* Backport #31339

Add view on GitHub links for easier content editing from the docs

Co-authored-by: Mark Otto <markd.otto@gmail.com>

* @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

Add toasts to the components requiring JavaScript

* clear timeout before showing the toast

* Add unit test

* Remove the check for timeout

* Check for clearTimeout to have been called

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
# Conflicts:
#	js/tests/unit/toast.spec.js

New default behavior for scroll anchoring (rolled out in Chrome 84?) leads to unsightly/odd accordion interactions - see #31341
This rule suppresses this new behavior and reverts back to the old way.

See https://drafts.csswg.org/css-scroll-anchoring/

* Expand advice for anchor-based controls

* Expand accessibility note in input group

* Correct statement about validation, fix server example

* Tweak label > accessible name

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Mark Otto <markd.otto@gmail.com>

* @rollup/plugin-node-resolve 8.1.0
* popper.js 1.16.1
* qunit 2.10.1
* rollup 2.21.0

* remove plugin-proposal-object-rest-spread
* add bugfixes
* `exclude: ['transform-typeof-symbol']` did nothing with our config

Prevent overflowing static backdrop modal animation

TODO: backport the test too

* Move color utility callouts to start of page

Hierarchically/structurally, in the position they are currently at, the two callouts seem like they "belong" just to the "background color" section. Moving them to the start makes it clearer that those two callouts relate to everything in the page (both "Color" and "Background color" classes.

* Change heading level

otherwise the assistive technology callout looks like it's hierarchically under the "Dealing with specificity" heading

* docs(example): floating-labels' better Edge fallback

* docs(example): refactor floating-labels' CSS