Add new wiki related partials

app/views/projects/wikis/_pages_wiki_page.html.haml

+%li
+  = link_to wiki_page.title, namespace_project_wiki_path(@project.namespace, @project, wiki_page)
+  %small (#{wiki_page.format})
+  .pull-right
+    %small Last edited #{time_ago_with_tooltip(wiki_page.commit.authored_date)}

app/views/projects/wikis/_sidebar_wiki_page.html.haml

+%li{ class: params[:id] == wiki_page.slug ? 'active' : '' }
+  = link_to namespace_project_wiki_path(@project.namespace, @project, wiki_page) do
+    = wiki_page.title.capitalize

app/views/projects/wikis/_wiki_page.html.haml

-- if context == 'sidebar'
-  %li{ class: params[:id] == wiki_page.slug ? 'active' : '' }
-    = link_to namespace_project_wiki_path(@project.namespace, @project, wiki_page) do
-      = wiki_page.title.capitalize
-- else
-  %li
-    = link_to wiki_page.title, namespace_project_wiki_path(@project.namespace, @project, wiki_page)
-    %small (#{wiki_page.format})
-    .pull-right
-      %small Last edited #{time_ago_with_tooltip(wiki_page.commit.authored_date)}
+= render "#{context}_wiki_page", wiki_page: wiki_page