This PR fixes / adds support for syntax highlighting in JSX and TSX.

Previously to this PR the syntax highlighting was not really working.
HTML tags have not been displayed as such.

<img width="1127" alt="SCR-20240212-ihne"
src="https://github.com/zed-industries/zed/assets/67913738/793c778f-aa11-4574-883f-6d336247bd9e">

After:

<img width="1225" alt="SCR-20240212-jqvv"
src="https://github.com/zed-industries/zed/assets/67913738/f4d96b1d-6063-41ac-bd46-76ce1fc0a131">

Release Notes:

- Added support for JSX and TSX syntax highlighting