Revert "Add YAML file type icon (#7185)" (#7286)

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 a853a80634.

Release Notes:

- N/A

assets/icons/file_icons/file_types.json

@@ -118,8 +118,8 @@
         "xlsx": "document",
         "xml": "template",
         "xrl": "erlang",
-        "yaml": "yaml",
+        "yaml": "settings",
-        "yml": "yaml",
+        "yml": "settings",
         "yrl": "erlang",
         "zlogin": "terminal",
         "zsh": "terminal",
@@ -190,9 +190,6 @@
         "php": {
             "icon": "icons/file_icons/php.svg"
         },
-        "yaml": {
-            "icon": "icons/file_icons/yaml.svg"
-        },
         "prettier": {
             "icon": "icons/file_icons/prettier.svg"
         },

assets/icons/file_icons/yaml.svg

@@ -1 +0,0 @@
-<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="457px" height="512px"><polygon points="342.0159302,0 457,0 114.9831009,512 0,512 171.0082092,256 0,0 114.9831009,0 228.4997559,169.9342041 "/></svg>