📓 fix ranking.md by @flancian ☆

#push [[agora maintenance]]
- rank = ['agora', 'flancian', 'vera', 'neil']
- https://github.com/flancian/agora-server/blob/bc5a0d14f0b728d22902a29c5437e415b23dccef/app/agora.py#L72
- #pull [[agora participation]]