Updated CSGO references to CS2

[Mantas-2155X]

The repository description should also be changed

[antonkesy]

Repo name, description, ... should also be updated

[pointydev]

To add my two cents, if the repository name is to be updated, the -osx-linux portion should be removed as well considering this has basically become a general issue tracker, and macOS support has been dropped entirely. cs2, counter-strike or counter-strike-2 would definitely be fitting names.