docs(elements): update v11 migration docs and add Sass API docs (#10624)

* docs(colors): update sass docs

* feat(elements): add sass module supports and update sass docs

* docs(v11): update colors, elements migration information

* docs(colors): update section title to API

* docs(v11): update language around sass changes

* docs(type): update usage and migration docs for type

* docs(themes): update v11 migration guide and usage docs

* docs(colors): update sass docs

* feat(elements): add sass module supports and update sass docs

* docs(v11): update colors, elements migration information

* docs(colors): update section title to API

* docs(v11): update language around sass changes

* docs(type): update usage and migration docs for type

* docs(themes): update v11 migration guide and usage docs

* docs(type): update usage docs to include type classes

* docs(layout): update sass and migration docs

* docs(themes): update v11 docs for themes

* fix(type): use breakpoint entrypoint

* fix(elements): update @forward to hide $prefix

Author: joshblack