Added meta to application.html.haml for groups and unmatched routes

• Added:
- meta to application.html.haml for groups and unmatched routes

app/views/layouts/application.html.haml

@@ -36,9 +36,10 @@
       = render 'stream_entries/meta', stream_entry: @stream_entry, account: @account
     - elsif @account && @account.local?
       = render 'accounts/meta', account: @account, older_url: nil, newer_url: nil
+    - elsif @group
+      = render 'groups/meta', group: @group
     - else
-      - description = strip_tags(t('about.tagline'))
-      %meta{ name: 'description', content: description }/
+      = render partial: 'shared/og'
 
     %title= content_for?(:page_title) ? safe_join([yield(:page_title).chomp.html_safe, title], ' - ') : title