Theme cleanup and structured for official release

For the new discourse customize theme feature I have reorganized all files and cleaned up legacy / old stuff.

You can now easily install it with few clicks.

You can read more about it in the README or here:
https://meta.discourse.org/t/alien-night-theme-a-free-dark-theme-for-discourse/54175/15

Have fun using it and I hope you like it!

Alien Night Dark Theme Discourse v1.1.1

Alien Night - A dark theme for Discourse

Changelog

v1.1.1

• Fix some contrast
• Merged desktop and mobile CSS together

v1.1

Add the theme switcher feature

v1.0

Init of the dark theme

Alien Night Dark Theme Discourse v1.1

Alien Night - A dark theme for Discourse

Changelog

v1.1

Add the theme switcher feature

v1.0

Init of the dark theme