feat: Update manifest files to version 3 and adjust permissions

Author: medyo

public/base.manifest.json

@@ -1,10 +1,25 @@
 {
+  "manifest_version": 3,
   "name": "Hackertab.dev - developer news",
   "description": "All developer news in one tab",
   "version": "1.20.1",
   "chrome_url_overrides": {
     "newtab": "index.html"
   },
+  "host_permissions": ["https://*.hackertab.dev/*"],
+  "content_scripts": [
+    {
+      "matches": [
+        "http://127.0.0.1:5173/*",
+        "http://localhost:5173/*",
+        "https://hackertab.dev/*",
+        "http://localhost:5173/*",
+        "https://hackertab-staging.deno.dev/*"
+      ],
+      "run_at": "document_start",
+      "js": ["content.js"]
+    }
+  ],
   "icons": {
     "16": "/logos/logo16.png",
     "32": "/logos/logo32.png",

public/chrome.manifest.json

@@ -1,7 +1,5 @@
 {
-  "manifest_version": 3,
   "background": {
     "service_worker": "background.js"
-  },
-  "host_permissions": ["https://*.hackertab.dev/*"]
+  }
 }

public/firefox.manifest.json

@@ -1,17 +1,5 @@
 {
-    "manifest_version": 2,
-    "background": {
-      "scripts": [
-        "background.js"
-      ]
-    },
-    "permissions": [
-      "https://*.hackertab.dev/*"
-    ],
-    "content_security_policy": "script-src 'self' object-src 'self'",
-    "applications": {
-      "gecko": {
-        "id": "{f8793186-e9da-4332-aa1e-dc3d9f7bb04c}"
-      }
-    }
-  }
+  "background": {
+    "scripts": ["background.js"]
+  }
+}