This PR reverts the addition of the YAML icon, as it doesn't look good
at the moment:

<img width="305" alt="Screenshot 2024-02-02 at 10 55 16 AM"
src="https://github.com/zed-industries/zed/assets/1486634/2fe2ddd5-5b73-4c52-a121-562d07352005">

This reverts commit a853a80634149ad5d069c48c4a0ece0bd584b5b1.

Release Notes:

- N/A