feat: add mastodon profile pic

[hanadi92]

Feature: use mastodon profile pic.

Behavior: user is prompt to add their username, then server name.

Limitations:

• Nextjs.config has the allowed remote hosts for the Image src, we cannot possibly count all mastodon servers as every server host their own avatars. (ideas are welcome here!)
• Avatar url is pulled from the server API, some documentations mention that it can be private info based on the server itself. but then it would return an error and we move on.