Revert "Added icon"

This reverts commit 0c7a74a820.

content.js

@@ -52,4 +52,4 @@ else {
     style.innerText = main_menu_css + other_css;
 }
 
-document.head.appendChild(style)
+document.head.appendChild(style)

manifest.json

@@ -2,16 +2,13 @@
     "manifest_version": 2,
 
     "name": "Custom Brandejs theme for IS",
-    "version": "1.2.1",
+    "version": "1.2",
     "description": "The only proper way to enjoy MUNI IS (shamelessly stolen)",
     "browser_specific_settings": {
         "gecko": {
             "update_url": "https://zylacx.github.io/updates.json"
         }
     },
-    "icons": {
-    	"16": "assets/icon.webp"	
-    },
     "content_scripts": [
         {
             "matches": ["https://is.muni.cz/auth/*"],