Rename project_head partial to settings_nav

app/views/deploy_keys/index.html.haml

app/views/deploy_keys/new.html.haml

app/views/deploy_keys/show.html.haml

app/views/hooks/index.html.haml

app/views/projects/_settings_nav.html.haml

app/views/projects/edit.html.haml

app/views/projects/empty.html.haml

app/views/projects/teams/available.html.haml

app/views/repositories/_head.html.haml

app/views/services/edit.html.haml

app/views/services/index.html.haml

app/views/team_members/import.html.haml

app/views/team_members/index.html.haml

app/views/team_members/new.html.haml