chore(logo): 🔧 move logo out of media to support vsce publish

Author: navin-moorthy

media/icon.png renamed to icon.png

@@ -68,7 +68,7 @@
   "engines": {
     "vscode": "^1.47.0"
   },
-  "icon": "https://raw.githubusercontent.com/navin-moorthy/vscode-css-snippets/master/media/icon.png",
+  "icon": "icon.png",
   "galleryBanner": {
     "color": "#EA2E6E",
     "theme": "dark"