Make README link on project home look nicer

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/_section.html.haml

@@ -26,8 +26,9 @@
   - if readme = @repository.readme
     .tab-pane#tab-readme
       %article.readme-holder#README
-        = link_to namespace_project_blob_path(@project.namespace, @project, tree_join(@repository.root_ref, readme.name)) do
-          %h4.readme-file-title
+        .clearfix
+          %small.pull-right
+            = link_to namespace_project_blob_path(@project.namespace, @project, tree_join(@repository.root_ref, readme.name)), class: 'light' do
               %i.fa.fa-file
               = readme.name
         .wiki