Add func language file icon (#221)

* add func file icon

* Clean up icon and fix typo

* biome format

---------

Co-authored-by: Miguel Solorio <miguel.solorio07@gmail.com>

README.md

@@ -186,6 +186,7 @@ You can choose which icons to use from the [Library](https://www.figma.com/file/
 |firebase|![firebase](preview/files/firebase.png)|
 |font|![font](preview/files/font.png)|
 |fsharp|![fsharp](preview/files/fsharp.png)|
+|func|[func](preview/files/func.png)|
 |fresh|![fresh](preview/files/fresh.png)|
 |gatsby|![gatsby](preview/files/gatsby.png)|
 |gear|![gear](preview/files/gear.png)|

src/symbol-icon-theme.json

@@ -254,7 +254,8 @@
 		"i18n": { "iconPath": "./icons/files/i18n.svg" },
 		"minecraft": { "iconPath": "./icons/files/minecraft.svg" },
 		"expressive-code": { "iconPath": "./icons/files/expressive-code.svg" },
-		"lunaria": { "iconPath": "./icons/files/lunaria.svg" }
+		"lunaria": { "iconPath": "./icons/files/lunaria.svg" },
+		"func": { "iconPath": "./icons/files/func.svg" }
 	},
 
 	"fileExtensions": {
@@ -606,7 +607,8 @@
 		"svgx": "image",
 		"toml": "gear",
 		"v": "v",
-		"nix": "nix"
+		"nix": "nix",
+		"fc": "func"
 	},
 
 	"fileNames": {
@@ -1338,7 +1340,8 @@
 		"vue-postcss": "vue",
 		"vue-html": "vue",
 		"ng-template": "angular",
-		"nix": "nix"
+		"nix": "nix",
+		"func": "func"
 	},
 
 	"folderNames": {