The Scss language only had highlighting queries for `@each` loops, this
commit adds support for `@for` loops as well.
Also moved all loop-related keywords (including newly added ones) to
`@repeat` rather than `@keyword`
* Comment: use `@combined` to create just one tree per buffer
There is no need to create a tree per line/block for comments.
Should fix https://github.com/nvim-treesitter/nvim-treesitter/issues/1251
* Add injections for scss
* Fix jsonc
* Combine jsdoc
