Updating IRC channel

Refactor dropdown.less. Optimize ".dropdown-menu > .disabled" selector.

README.md: Change links to use HTTPS

fixes #14282 - Already Visible collapse gets closed when …

Ukrainian site migrates on twbs.docs.org.ua

consistently use <nav> instead of <div> for .navbar in docs

Remove popover content with .children().detach() instead of .empty()

[skip validator]

Remove `time` from `.travis.yml`.

Travis CI now does this automatically.

Use closest `.alert` for alert dismissal; closes #14306

Fix `grunt dist` under Bower by separating docs into separate task

Add retries to uncached-npm-install.sh

fix typo in ukrainian doc description

Pull requests are frequently failing on Travis due to npm flakiness
(I think) travis_retry isn't available in indirect subshells like this

Refs #14388.

Clean up buttons documentation