Add functionality to contact inst maintainer link

src/invidious/helpers/helpers.cr

@@ -73,6 +73,7 @@ class Config
   property output : String = "STDOUT"                # Log file path or STDOUT
   property log_level : LogLevel = LogLevel::Info     # Default log level, valid YAML values are ints and strings, see src/invidious/helpers/logger.cr
   property db : DBConfig? = nil                      # Database configuration with separate parameters (username, hostname, etc)
+  property instance_maintainer_email : String? = nil # Email to contact the instance maintainer. This is used within the footer as an mailto link.
 
   @[YAML::Field(converter: Preferences::URIConverter)]
   property database_url : URI = URI.parse("")      # Database configuration using 12-Factor "Database URL" syntax

src/invidious/views/template.ecr

@@ -232,8 +232,8 @@
                   <b class="footer-section-header"><%= translate(locale, "Support")%></b>
                   <ul class="pure-menu-list footer-section-list">
                       <li class="pure-menu-item footer-section-item">
-                        <!-- TODO -->
-                          <a href="#" title="<%= translate(locale, "Contact instance maintainer")%>">
+                          <% link = CONFIG.instance_maintainer_email ? "mailto:#{CONFIG.instance_maintainer_email}" : "#"%>
+                          <a href=<%=link%> title="<%= translate(locale, "Contact instance maintainer")%>">
                               <%= translate(locale, "Contact instance maintainer") %>
                           </a>
                       </li>