Remove garbage and apply wiki style

app/controllers/help_controller.rb

app/views/help/_api_layout.html.haml

app/views/help/_layout.html.haml

app/views/help/api.html.haml

app/views/help/markdown.html.haml

app/views/help/permissions.html.haml

app/views/help/public_access.html.haml

app/views/help/raketasks.html.haml

app/views/help/security.html.haml

app/views/help/show.html.haml

app/views/help/ssh.html.haml

app/views/help/system_hooks.html.haml

app/views/help/web_hooks.html.haml

app/views/help/workflow.html.haml