Rewrite written docs/descriptions/announcements

[pixlcrashr]

I recently saw that our README.md file is deprecated. We should update it.
By that we also should restructure the readme.

[Saborknight]

Yeah, I was waiting until we have a release ready before doing that, no point in changing now if something changes in the future, requiring another Readme rewrite. Or that's what my thought on it was

[Saborknight]

Items which will need to be rewritten just before release of v1.0:

1. readme.md
2. Steam workshop description
3. Author announcement

[Saborknight]

Since there's no tooltip to tell the user about this anymore, make sure to include a particular mention that left click enables controls, and right click closes the sheet entirely.