Add the ability to use a gravatar for the profile image

[ChaelCodes]

Description of Feature or Issue

closes #55

Utilize Gravatar for profile image. This avoids our app being responsible for images that users have uploaded, and saves on costs, because we don't have to have an S3 or GCP bucket. :)

Checklist

• [x] Added/changed specs for the changes made
• [x] Is the linting build successful?
• [x] Is the test build successful?

User-Facing Changes

Label	Screenshot
New Profile
Old Profile
New Profile Mobile
Old Profile Mobile