Move ACP nav entry to templating

Closes #516

templates/channel.pug

@@ -22,6 +22,7 @@ html(lang="en")
               ul.dropdown-menu
                 li: a(href="#" onclick="javascript:chatOnly()") Chat Only
                 li: a(href="#" onclick="javascript:removeVideo(event)") Remove Video
+            +navsuperadmin(true)
           +navloginlogout(cname)
       section#mainpage
         .container

templates/index.pug

@@ -11,6 +11,7 @@ html(lang="en")
         #nav-collapsible.collapse.navbar-collapse
           ul.nav.navbar-nav
             +navdefaultlinks("/")
+            +navsuperadmin(false)
           +navloginlogout("/")
       section#mainpage
         .container

templates/nav.pug

@@ -36,6 +36,13 @@ mixin navdefaultlinks(page)
         li: a(href=loginDomain+"/login?dest=" + encodeURIComponent(baseUrl + page)) Login
         li: a(href=loginDomain+"/register") Register
 
+mixin navsuperadmin(newTab)
+  if superadmin
+    if newTab
+      li: a(href="/acp", target="_blank") ACP
+    else
+      li: a(href="/acp") ACP
+
 mixin navloginlogout(redirect)
   if loggedIn
     +navlogoutform(redirect)