Feature/launch page

Still a WIP as I need some input on the content and need to fix a minor issue or two

WEBSITE-1082
As for the details:
https://github.com/phpbb/phpbb/compare/develop-olympus...develop-ascraeus
so 10k commits

https://github.com/phpbb/phpbb 22.8k
https://github.com/phpbb/phpbb/tree/develop-olympus 12.1k so its about 10.5k commits since 3.0
For the number of bugs just check the tracker for `project = phpBB3 AND fixVersion > 3.1.0-dev AND NOT fixVersion <= 3.0.12 AND resolution in (Closed, Fixed, Resolved)` which says: 1,542, so its about 1.5k bugs/features fixed/implemented