Fixes for using pypi package

- Fix static path for manifest and login logo.
- Use insecure=True (required to serve static files via development
  server with DEBUG=False).

client/src/app/site/login/components/login-wrapper/login-wrapper.component.html

@@ -1,7 +1,7 @@
 <!-- The actual form -->
 <header>
     <mat-toolbar class="login-logo-bar" color="primary">
-        <a routerLink="/login"><img src="/assets/img/openslides-logo-h-dark-transparent.svg" alt="OpenSlides-logo"></a>
+        <a routerLink="/login"><img src="assets/img/openslides-logo-h-dark-transparent.svg" alt="OpenSlides-logo"></a>
     </mat-toolbar>
 </header>
 <main>

client/src/index.html

@@ -8,7 +8,7 @@
 
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="icon" type="image/x-icon" href="assets/img/favicon.png">
-    <link rel="manifest" href="manifest.json" />
+    <link rel="manifest" href="/manifest.json" />
     <meta name="theme-color" content="#317796">
 </head>
 

openslides/core/views.py

@@ -89,7 +89,7 @@ class IndexView(View):
         requested, the index.html is delivered.
         """
         try:
-            response = serve(request, path, **kwargs)
+            response = serve(request, path, insecure=True, **kwargs)
         except Http404:
             response = static.serve(
                 request,