config: rename twitter_site to twitter_username.

app/views/layouts/default.html.erb

@@ -19,7 +19,7 @@
   <% if CurrentUser.user.custom_style.present? && params.fetch(:css, "true").truthy?  %>
     <%= stylesheet_link_tag custom_style_users_path(md5: Digest::MD5.hexdigest(CurrentUser.user.custom_style)), media: "screen" %>
   <% end %>
-  <% if Danbooru.config.twitter_site %>
+  <% if Danbooru.config.twitter_username.present? %>
     <script type="application/ld+json">
       {
         "@context" : "http://schema.org",
@@ -27,7 +27,7 @@
         "name" : "<%= Danbooru.config.app_name %>",
         "url" : "<%= root_url %>",
         "sameAs" : [
-          "https://twitter.com/<%= Danbooru.config.twitter_site[1..-1] %>"
+          "https://twitter.com/<%= Danbooru.config.twitter_username %>"
         ]
       }
     </script>
@@ -70,12 +70,13 @@
   <%= tag.meta property: "og:description", content: meta_description %>
   <%= tag.meta property: "og:url", content: request.original_url %>
 
-  <% if Danbooru.config.twitter_site.present? %>
-    <%= tag.meta name: "twitter:site", content: Danbooru.config.twitter_site %>
-    <%= tag.meta name: "twitter:title", content: page_title %>
-    <%= tag.meta name: "twitter:description", content: meta_description %>
+  <% if Danbooru.config.twitter_username.present? %>
+    <%= tag.meta name: "twitter:site", content: "@#{Danbooru.config.twitter_username}" %>
   <% end %>
 
+  <%= tag.meta name: "twitter:title", content: page_title %>
+  <%= tag.meta name: "twitter:description", content: meta_description %>
+
   <%= yield :html_header %>
   <%= raw Danbooru.config.custom_html_header_content %>
 </head>

config/danbooru_default_config.rb

@@ -425,7 +425,9 @@ module Danbooru
       end
     end
 
-    def twitter_site
+    # The twitter username associated with this site (username only, don't include the @-sign).
+    def twitter_username
+      nil
     end
 
     # include essential tags in image urls (requires nginx/apache rewrites)