### Docs update.
- adding 'what is Dexter' one-liner
- adding config examples
Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [~] Unsafe blocks (if any) have justifying comments
- [~] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [~] Tests cover the new/changed behavior
- [~] Performance impact has been considered and is acceptable
✅ Elixir LS update -
[PR](https://github.com/zed-extensions/elixir/pull/115) merged
Release Notes:
- N/A
---------
Co-authored-by: AltCode <altcode@vivaldi.net>
