[llvm] [BOLT][Documentation] Prepare documentation for hosting (PR #201378)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis commented:

At a first glance, this looks good, thanks Amina! Any thoughts from Meta?

Have we made any progress on reserving a subdomain?

https://github.com/llvm/llvm-project/pull/201378