improvements to webmanifest

templates/index.html.j2

@@ -6,7 +6,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>{{ title }}</title>
   {%- if webmanifest %}
-  <link rel="manifest" href="/manifest.json">
+  <link rel="manifest" href="/.static/manifest.json">
   {%- endif %}
   <link rel="icon" type="image/x-icon" href="{{ favicon }}">
   <link rel="stylesheet" href="{{ stylesheet }}">

templates/manifest.json.j2

@@ -1,5 +1,7 @@
 {
     "name": "{{ name }}",
+    "short_name": "{{ short_name }}",
+    "description": "{{ name }} - A static web gallery - made with StaticGalleryBuilder (https://github.com/greflm13/StaticGalleryBuilder)",
     "icons": [
         {% for icon in icons -%}
         {
@@ -10,7 +12,7 @@
         }{% if not loop.last %},{% endif %}
         {%- endfor %}
     ],
-    "id": "{{ id }}",
+    "id": "/",
     "start_url": "/",
     "background_color": "{{ background_color }}",
     "display": "standalone",