- Move disabled radio and checkbox styles to Reboot
- Collapse .radio and .checkbox into single class, .form-check
- Collapse .radio-inline and .checkbox-inline into single class, .form-check-inline
- Require classes for sub-elements in both new classes

Fixes #18705: Clarify removal of .help-text and update changes to .form-group for horizontal layouts

v4: Inverse table variants

Add disabled styling for .custom-select

Added explicit commentary to .card-* classes

Update Normalize to v4.0.0

- Change some things around, add some copy
- Include table variant styles for the inverse tables thanks to bg and color utils

Add GitHub issue template

Update overview.md

Jank card borders were too janky

Add $card-img-overlay-padding variable

Extract $carousel-icon-width variable

- Drops the experiment I had going for `box-shadow`-powered borders
- Reinstates regular `border` using existing variables

Fixes  #19097 and #19143. Nullifies #19828.

Use alphabetic order for the Components doc menu

[skip sauce]

endtag for the highlight

add the `@include media-breakpoint-only()` and `@include media-breakpoint-between` mixins