Add support for configurable administrator email

src/invidious.cr

@@ -5848,12 +5848,9 @@ end
 error 500 do |env|
   error_message = <<-END_HTML
   Looks like you've found a bug in Invidious. Feel free to open a new issue
-  <a href="https://github.com/omarroth/invidious/issues">
+  <a href="https://github.com/omarroth/invidious/issues">here</a>
-    here
-  </a>
   or send an email to
-  <a href="mailto:omarroth@protonmail.com">
+  <a href="mailto:#{CONFIG.admin_email}">#{CONFIG.admin_email}</a>.
-    omarroth@protonmail.com</a>.
   END_HTML
   templated "error"
 end

src/invidious/helpers/helpers.cr

@@ -234,7 +234,8 @@ struct Config
     force_resolve:     {type: Socket::Family, default: Socket::Family::UNSPEC, converter: FamilyConverter}, # Connect to YouTube over 'ipv6', 'ipv4'. Will sometimes resolve fix issues with rate-limiting (see https://github.com/ytdl-org/youtube-dl/issues/21729)
     port:              {type: Int32, default: 3000},                                                        # Port to listen for connections (overrided by command line argument)
     host_binding:      {type: String, default: "0.0.0.0"},                                                  # Host to bind (overrided by command line argument)
-    pool_size:         {type: Int32, default: 100},
+    pool_size:         {type: Int32, default: 100},                                                         # Pool size for HTTP requests to youtube.com and ytimg.com (each domain has a separate pool of `pool_size`)
+    admin_email:       {type: String, default: "omarroth@protonmail.com"},                                  # Email for bug reports
   })
 end