Refactor html templates

This commit entirely refactors the use of html templates. Instead of
inheriting from a shared template, we insert the results into a base
template.

internal/dis/component/auth/panel/templates/ssh.html

@@ -1,8 +1,3 @@
-{{ template "_base.html" . }}
-{{ define "title" }}SSH Keys{{ end }}
-
-{{ define "content" }}
-
 <div class="pure-u-1">
     <p>
         This page allows you to add, view and remove ssh keys to and from your distillery account.
@@ -101,4 +96,3 @@ Host {{ .Domain }}.proxy
     </code>
 </div>
 </div>
-{{ end }}