We need to pass different options and this seems cleaner at this point.

In order for docs.min.js to keeps all comments, we don't pass `compress`.

Solution mentioned by Chris Baswell at https://stackoverflow.com/a/45969088

Since flex-order was renamed to just order, change the subtitle.

I feel like `auto` is missing from the values here and that it should be there. Although it is mentioned below, only a single use case, whereas in other sections it appears with the option to set the left margin of an element to auto, for example.

Remove accidental `alt` addition from Bootstrap stack image.

Check `form-control-focus` mixin, variable name is `$input-focus-border-color`

We can check for browser compatibility on lint time now.

This is so other plugins can use it too.

* use a trailing slash when possible
* use https when possible
* remove a few redirected links
* consistently use `https://popper.js.org/`
* fix `iconUrl` in nuget files
* change Jekyll Windows guide to the official one

`abs()` gets the absolute value of `$level`.
That way, `if/else` statement can be completely eliminated.

Add .txt and remove the non-existent .py files.

This way, it's run for us automatically after `docs-compile`.

Switch all instances to `sh` but keep `bash` so that things won't break either way.

* ignore `twbsconfig.yml`
* add a trailing slash for folders

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