Move wiki delete button to the edit page

app/views/wikis/edit.html.haml

 %h3.page_title Editing page
 %hr
 = render 'form'
+
+.right
+  - if can? current_user, :admin_wiki, @project
+    = link_to project_wiki_path(@project, @wiki), confirm: "Are you sure you want to delete this page?", method: :delete, class: "btn small danger" do
+      Delete this page
\ No newline at end of file

app/views/wikis/show.html.haml

@@ -16,6 +16,3 @@
       = markdown @wiki.content
 
 %p.time Last edited by #{@wiki.user.name}, #{time_ago_in_words @wiki.created_at} ago
-- if can? current_user, :admin_wiki, @project
-  = link_to project_wiki_path(@project, @wiki), confirm: "Are you sure you want to delete this page?", method: :delete do
-    Delete this page