aurweb: release 6.2.8

Release containing the Trusted User -> Package Maintainer name change.

• bump version
• services: rename tuvotereminder to votereminder
• nginx: redirect /tu to /package-maintainer
• nginx: remove /trusted-user/TUbylaws.html redirect

Will need manual intervention on the aurweb box after deployment:

• Remove old aurweb-tuvotereminder service/timer units