Various design improvements (#42)

There are a couple of minor improvements which customers solve at the moment with various hacks and should be part of the theme instead.

* Removed max-width from card excerpt

* Updated custom theme settings

- Added show/hide "Read more" section in posts
- Added drop-cap option for posts
- Added show/hide metadata for posts

* Added lock icon for members-only posts on list

* Updated excerpt logic to work with access levels

* Fixing missing id's for input fields

* Updated secondary color contrast

package.json

@@ -191,6 +191,21 @@
                 "type": "boolean",
                 "default": false,
                 "group": "homepage"
+            },
+            "show_post_metadata": {
+                "type": "boolean",
+                "default": true,
+                "group": "post"
+            },
+            "enable_drop_caps_on_posts": {
+                "type": "boolean",
+                "default": false,
+                "group": "post"
+            },
+            "show_related_articles": {
+                "type": "boolean",
+                "default": true,
+                "group": "post"
             }
         }
     },