* Disable negative margins by default

* Use shorter enable variable

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

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

Not applicable anymore since https://github.com/twbs/bootstrap/pull/29348

* Remove unnecessary comma in 'All colors'

(Using a comma between a subject and predicate)[https://en.wikipedia.org/wiki/Comma#Between_the_subject_and_predicate

] is nonstandard.

* Update theming.md

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

- Enable RFS
- Add documentation
- Disable doc font size overrides

* Add variables for shades and tints of each major color

* getting-started/theming.md: use a `range`.

Use the built-in utilities instead.

Also, add a warning in _root.scss so that we don't miss it again.

Drop `color()`, `theme-color()` & `gray()` functions  in favor of variables. The functions just called a `map-get()` of a map where just the variables were defined. 

Also the `theme-color-level()` now accepts any color you want instead of only `$theme-colors` colors. The first value now is a variable instead of the `$theme-colors` key.

* Use escape-svg() function

* Update theming.md

Media queries do not support CSS custom properties (CSS variables), so we've had some useless variables lying around since shipping v4. This finally removes them and the associated documentation content that explained the situation.

Fixes #29012.

This allows for the build to fail if a reference isn't found.

No more Ruby dependency and most important more than 10 times less build time (at least on Windows)!

* Prep for v4.3.0

* More updates for v4.3.0.

* rerun to build docs source map

- Move 4.1 docs to 4.2
- Update versions everywhere to 4.1.3 with release script
- Manually bump the shorthand version in package.json
- Add 4.2 to the versions docs page
- Update some redirects
- Fix tests asset URLs
- Bump Nuget and more

* Tweak the accessibility/reduced motion text

include mention of carousel slides, remove the (now inaccurate, as Firefox 63 includes it too) mention that support is limited to Safari/macOS

xref https://github.com/twbs/bootstrap/issues/27525

* Add new callout for reduced motion

* Add variable to control prefers-reduced-motion media query support

* Add callout about prefers-reduced-motion to all components currently using animation which are affected