Remove projects/_show partial

I have no earthly idea what this file was for, but I couldn't find it being
rendered anywhere.

app/views/projects/_show.html.haml

-%h5.title
-  = @project.name
-%br
-%div
-  %a.btn.info{href: tree_project_ref_path(@project, @project.root_ref)} Browse code
-   
-  %a.btn{href: project_commits_path(@project)} Commits
-  %strong.right
-    = link_to project_path(@project) do
-      Switch to project →
-%br
-.alert-message.block-message.warning
-  .input
-    .input-prepend
-      %span.add-on git clone
-      = text_field_tag :project_clone, @project.url_to_repo, class: "xlarge one_click_select git_clone_url"
-
-= simple_format @project.description
-- unless @events.blank?
-  %h4.middle_title Recent Activity
-  .content_list= render @events
-
-