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
```
$ git rev-list release-3.0.12..develop-ascraeus --count --grep="Merge PR .*" --first-parent
119
$ git rev-list release-3.0.12..develop-ascraeus --count --grep="Merge pull request .*" --first-parent
637
$ git rev-list release-3.0.12..develop-ascraeus --count --grep="Merge remote-tracking branch '.*" --first-parent
707
$ git rev-list release-3.0.12..develop-ascraeus --count --grep="Merge branch '.*" --first-parent
775
```
so around 2238 PR and assimilated (all the commits before "b68de23 merge changes from 3.0.x branch" aren't counted)