Please bring referencesource.microsoft.com back!

[liang2zhu1]

This was so useful we have Roslyn powered code navigation it's really difficult to navigate the code without the website. Yesterday it was fine and today it's redirected here, for a moment I feel I must lost memory that the URLs cached in my browser are taking me to the Repo than the Index site.

[liang2zhu1]

Actually realized we have (an earlier filed) #213 saying the same (but the issue title is a bit hard to actually search :)) so fine if we dupe to that one but would suggest to modify title there.