[!233] Move BibTex file to static/

Merge branch 'fix-bib-location' into 'master'

ref:infrastructure/dune-website Hopefully this now shows on the web

Closes: [#35] (again)

See merge request [!233]

  [#35]: gitlab.dune-project.org/NoneNone/issues/35
  [!233]: gitlab.dune-project.org/infrastructure/dune-website/merge_requests/233


Closes #35