Migrates `src/components/base/markdown/markdown.scss` away from utility
mixins `@include`s. This stylesheet used very specific style definitions
that aren't used anywhere else. Moreover, `GlMarkdown` might be
deprecated. It is therefore preferable not to add those style
definitions to Tailwind's config for now.

The `GlSegmentedControl` component is deprecated, so we do not need to
bloat the Tailwind config with the legacy utility mixins it uses. We are
migrating to direct style definitions until the component gets removed.

Migrates utility mixins `@include`s to Tailwind's `@apply` directive.

Migrates `src/scss/typescale/_index.scss` to Tailwind's `@apply`
directive.

Migrate box-shadow `@include`s to direct style definitions.

Migrate away from remaining utility mixins

See merge request gitlab-org/gitlab-ui!4681



Merged-by: Lukas Eipert <leipert@gitlab.com>
Approved-by: Lukas Eipert <leipert@gitlab.com>
Reviewed-by: Lukas Eipert <leipert@gitlab.com>
Reviewed-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Reviewed-by: Peter Hegman <phegman@gitlab.com>
Co-authored-by: Paul Gascou-Vaillancourt <paul.gascvail@gmail.com>

Both webpack and vite are configurable to look at the mainFields of a
project. We currently expose `src/index.js` under `source`. A lot of
other projects, especially typescript projects do the same.

If we just introduce a new main field (`vueSource`) which currently
noone uses, we can easily configure `vite` and webpack to consume
`@gitlab/ui` from source.

Allow GitLab UI to be imported from source

See merge request gitlab-org/gitlab-ui!4102



Merged-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Approved-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Co-authored-by: Lukas Eipert <leipert@gitlab.com>

# [96.2.0](gitlab-org/gitlab-ui@v96.1.0...v96.2.0) (2024-10-10)

### Features

* Add new mainField `vueSource` to package.json ([bec84bcf](gitlab-org/gitlab-ui@bec84bcf))