Added Apple web-app meta tag #358 (#359)

* Added Apple web-app meta tag #358

* Added manifest file for web app

* Changed manifest to use template #358

* Small tweaks, add tests

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Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/views/manifest.py

@@ -0,0 +1,13 @@
+from django.http import JsonResponse
+from django.conf import settings
+
+
+def manifest(request):
+    response = {
+        "short_name": "linkding",
+        "start_url": "bookmarks",
+        "display": "standalone",
+        "scope": "/" + settings.LD_CONTEXT_PATH
+    }
+
+    return JsonResponse(response, status=200)