- [x] Basic diagnostics 
- [ ] Autocompletion
  - [x] Autocomplete properties
  - [ ] Autocomplete values
- [ ] Formatting using prettier.
- [x] Docs on hover
- [x] Add CI
- [x] Figure out attribution for stuff from MDN
- [x] Fork [tree-sitter-css](https://github.com/tree-sitter/tree-sitter-css) and adjust to GTK syntax.
  - [x] Jump to definition
  - [x] Better hovering
  - [ ] Better auto-completion
  - [ ] Documentsymbols
    - [x] Colors defined using `@define-color`
    - [ ] How to represent RuleSets?

