Add documentation / wiki regarding StackContinuation arguments during debug session

[dmjio]

Currently certain stack frames (i.e. CatchRetry) have generic arguments, it might be beneficial to provide hover state that has a URL linking to relevant source code documentation (e.g. GHC RTS Source / Commentary - with line numbers).

The same can be done for variables as well / heap objects.

Add our own wiki pages as well.

Hover links could be here: