compiler options page needs a refresh for 2.13

[SethTisue]

https://docs.scala-lang.org/overviews/compiler-options/index.html needs updating (reported by @nafg on Gitter)

the compilerOptionsExporter subproject in the scala/scala report semi-automates this, so someone needs to run that and then put together a PR.

volunteer?

[som-snytt]

nafg is so helpful. This is on the list at scala/scala#7686 which became scala/scala#7908.

The build task could use some improvement to reduce hand tweaks.

I'll try to get to it in the absence of a volunteer, but perhaps helpful nafg will take it up.

[exoego]

Opened a PR in #1435