Presale: remove webmanifest (#5275)

* Remove webmanifest from presale

* move webmanifest from presale to base urls

src/pretix/base/views/webmanifest.py

@@ -0,0 +1,52 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from django.http import HttpResponse
+from django.templatetags.static import static
+from django.views.decorators.cache import cache_page
+
+
+@cache_page(3600)
+def webmanifest(request):
+    return HttpResponse(
+        """{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "%s",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "%s",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#3b1c4a",
+    "background_color": "#3b1c4a",
+    "display": "standalone"
+}""" % (
+            static('pretixbase/img/icons/android-chrome-192x192.png'),
+            static('pretixbase/img/icons/android-chrome-512x512.png'),
+        ), content_type='text/json'
+    )