Revert "Merge branch 'master' of https://gitlab.doc.ic.ac.uk/resource-reasoning/www-rw.doc.ic.ac.uk"

This reverts commit a9cf459f5da4fdccf215f3501dd04726cd796070, reversing
changes made to e6f81b0023b73c2e3556f761cc87fe4d6f53cf8b.

Conflicts:
	_research/concurrency.md

References #9

Photos now automatically selected from the directory /images/people,
assuming that the image has the same file name as the profile page,
switching md for jpg.

Add anonymous icon for missing profile photos.

Add skeleton profiles for the JS team.

Fix person card heights, add padding between cards.

* People may be assigned to multiple research projects.
* Plugin for advanced filter expressions (see also
  https://github.com/jekyll/jekyll/pull/4478)

It may be useful to keep in /vol/rr/www so that future people joining
the group know where to look for edit access.

References #4