v0.20.0 — Fix eligibility matching + About page team section

Bug fix and demo-prep polish:

• Fixed "Matches you" badge: preference matching previously required
  both audience AND region to overlap, so e.g. a UK-based researcher would
  never match, since nearly all researcher-tagged opportunities are
  Global/Remote rather than region-specific. Now matches on either axis.
• About page: added a small "At your service" team section with photos
  for all three contributors, ahead of the university demo.