main menu: remove aliases and implications pages.

Remove links to the aliases and implications pages from the main menu.
Put them in the submenu on the /tags page instead.

These pages are too rarely used to deserve being in the toplevel menu.
They also weren't easy to find for non-Builders. The toplevel menu
shouldn't be dependent on user level.

app/views/layouts/_main_links.html.erb

@@ -9,10 +9,6 @@
   <%= nav_link_to("Notes", notes_path) %>
   <%= nav_link_to("Artists", artists_path) %>
   <%= nav_link_to("Tags", tags_path) %>
-  <% if CurrentUser.is_builder? %>
-    <%= nav_link_to("Aliases", tag_aliases_path) %>
-    <%= nav_link_to("Implications", tag_implications_path) %>
-  <% end %>
   <%= nav_link_to("Pools", gallery_pools_path) %>
   <%= nav_link_to("Wiki", wiki_page_path("help:home")) %>
   <%= nav_link_to("Forum", forum_topics_path, :class => (CurrentUser.has_forum_been_updated? ? "forum-updated" : nil)) %>

app/views/tags/_secondary_links.html.erb

@@ -1,9 +1,11 @@
 <% content_for(:secondary_links) do %>
   <%= quick_search_form_for(:name_matches, tags_path, "tags", autocomplete: "tag") %>
   <%= subnav_link_to "Listing", tags_path %>
+  <%= subnav_link_to("Aliases", tag_aliases_path) %>
+  <%= subnav_link_to("Implications", tag_implications_path) %>
   <%= subnav_link_to "Related tags", related_tag_path %>
-  <%= subnav_link_to "Cheatsheet", wiki_page_path("help:cheatsheet") %>
   <%= subnav_link_to "Help", wiki_page_path("help:tags") %>
+
   <% if @tag %>
     <li>|</li>
     <%= subnav_link_to "Posts (#{@tag.post_count})", posts_path(:tags => @tag.name) %>