`community-docs` CI is using the non-bootstrapped library

[nicolasstucki]

community-docs CI is using the non-bootstrapped library. It must use the bootstrapped version of the library.

This was seen in https://github.com/lampepfl/dotty/pull/11074/checks?check_run_id=1689298098 where one of the methods was implemented ??? only on the non-bootstrapped.

[nicolasstucki]

It looks like when we do community-build/compile we compile community-build/src/scala/dotty/communitybuild/projects.scala using the non bootstrapped library. This fails as there is a macro reflectedFields that tries to expand using the non-bootstrapped library.