Matthew Pickering authored Mar 22, 2023 and Ben Gamari committed May 16, 2023

* Generate docs/index.html to include the version of the ghc library

* This also fixes the packageVersions interpolations which were
  - Missing an interpolation for `LIBRARY_ghc_VERSION`
  - Double quoting the version so that "9.7" was being inserted.

Fixes #23121

(cherry picked from commit d7a768a4)