feat: add shared Toolbox header and themes

public/toolbox-app.json

@@ -8,13 +8,6 @@
   "icon": "./favicon.svg",
   "categories": ["documents", "pdf"],
   "tags": ["merge", "split", "rotate", "reorder"],
-  "actions": [
-    {
-      "id": "source",
-      "label": "Source",
-      "url": "https://git.add-ideas.de/zemion/pdf-tools/src/tag/v0.3.4"
-    }
-  ],
   "integration": {
     "contextVersion": 1,
     "launchModes": ["navigate", "new-tab"],
@@ -35,5 +28,5 @@
     "repository": "https://git.add-ideas.de/zemion/pdf-tools",
     "license": "AGPL-3.0-only"
   },
-  "version": "0.3.4"
+  "version": "0.4.0"
 }