Kristiyan Kostadinov 3d1c905c91 refactor(docs-infra): clean up AIO Sass files (#42442)
Cleans up AIO's Sass files by:
* Switching them all over to the `@use`-based API from Angular Material.
* Removing the import of the Material theming API in a bunch of places that weren't using it.
* Migrating the new usages of Sass utility functions to the new syntax (e.g. `map.get` vs `map-get`).
* Fixing a few files that were using 4 spaces for indentation instead of 2.

PR Close #42442
2021-06-02 13:25:42 -07:00
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