Use Flask v2.0's `delete`/`get`/`patch`/`post` route shortcuts
Clarify names of packages, modules with database models
Update copyright notes for 2021
Refer to license as "Revised BSD" to clarify that it is not customized
The common name "Modified BSD License" for the 3-clause BSD license can
be misleading as it might suggest it is a BSD license customized by the
To avoid this, refer to the license under one of its other names
Revert "Use `Maybe` return type for user avatars, user badges"
This reverts commit e85d7e28b041219bc33b19743d04de458839b2ee.
Use `Maybe` return type for user avatars, user badges
Add Gravatar.com-like API endpoint to obtain user avatar for MD5 hash of user's email address