Update feature: Move theme.css to style.css and increased weight

We no longer need theme_name.css now, so rolling back to style.css
adn increased the wieght to make sure it loads last in order
New feature: Added admin css support loads after the theme css
New feature: Added welcome.css for better support loads before theme.css
New feature: Added seperate css fro admin welcome and theme stub
Update feature: Update cerber theme