Documentation generator is properly broken

[pblasucci]

It's ancient -- so hopefully not a surprise to anyone -- but at this point, the script to generate documentation is hopeless unusable.

Major issues:

• FSharp.Formatting has a very different API
• FSharp.Formatting no longer uses Razor
• FSharpPowerTools no longer exists
• The Paket, Fake integration is wrong
• Nothing is setup to work on case-sensitive file systems

Suggested fixes (ideally all of these -- but at least 1 and 2):

1. Upgrade FSharp.Formatting
2. Rework templates to remove Razor
3. Rework documentation folders to take advantage of fsdocs tool
4. Eliminate Generate.fsx (this should just be part of build.fsx and should be a lot simpler if fsdocs tool is leveraged)

[pblasucci]

Important: any work for this should be done on the fx-upgrade branch.

[pblasucci]

Closing as part of archival process.