Monthly chores - September 2020

[gewarren]

• Check broken links report for dotnet/docs
• Check broken links report for dotnet/dotnet-api-docs
• Check microsoftdocs/feedback for .NET issues
• Run CleanRepo and check for orphaned articles
• Run CleanRepo and delete orphaned images
• Run CleanRepo and fix up links (redirects, site-relative)

[Youssef1313]

I believe the F# links should have been fixed recently (there were multiple PRs to use https://fsharp.github.io/fsharp-core-docs/). Does the broken link report show any broken links in F#?