* first pass at creating the aspnet/aspnet core signalr box
* trying to fix include file path
* added the box to various pages to test to see if its too big/too much
* fixed outbound URLs in the include
* trying the signalr version disambiguation box throughout
* repairing include formatting
* trying to repair the include format
* final attempt to fix the includes with this relative path thing
* SignalR version disambiguation box include path patch (#9974)
- updated all www.visualstudio.com urls to visualstudio.microsoft.com (and added campaign ID for downloads from docs.microsoft.com)
- made other obvious fixes to older versions of Visual Studio
- trim whitespace
Contributes to #8848
Brady Gaster
Genevieve Warren
Rick Anderson
Luke Latham
Rachel Appel