- Refactoring that simplifies finding things:
```md
## BEFORE
- Rich Text
- Overview
- Slate
- Lexical
- Lexical
- Overview
- Converters
- Migration
- Custom Features
## AFTER
- Rich Text
- Overview
- Converters
- Custom Features
- Migration
- Slate (legacy)
```
- It takes some of the spotlight away from Slate. Lexical is assumed as
the default editor and a banner at the beginning refers to the Slate
documentation.
- Various writing improvements.
PENDING:
- [ ] some 301 redirects needed
- `/docs/rich-text/lexical` to `/docs/rich-text/overview`
- `/docs/lexical/overview` to `/docs/rich-text/overview`
- `/docs/lexical/converters` to `/docs/rich-text/converters`
- `/docs/lexical/migration` to `/docs/rich-text/migration`
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