Remove WDN references and other layout cleanup

composer.json

composer.lock

less/main.less

public/css/main.css

src/Controllers/LockupsController.php

src/Models/Lockup.php

src/Views/download_lockup_files.php

src/Views/home.php

src/Views/lockup_library.php

src/Views/main_template.php

src/Views/manage_lockups.php

src/Views/new_lockup.php

src/Views/preview_lockup.php

src/Views/regenerate.php