[web] make time less offensive

Summary:
still needs work, just a short term stop gap

Alignment issues will be fixed in a follow-up diff. This is just matching up the font with figma: https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=1170%3A78356

Test Plan: make sure time text is consistent

Reviewers: atul, ashoat

Reviewed By: atul, ashoat

Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D2961