[MVP Carry-Over] Contributor Signup page

The registration/sign-up page is something that allows users willing to have the role of Contributor to create a profile.

1. The following details need to ask from the user while creating a profile https://docs.google.com/document/d/1YftclxKe50ejHNwNEki40RiR6fD5637rUietK0Du-5M/edit#bookmark=id.gfx9bxaz2br1 (Refer to Users table)

2. Since these are personal details, they need to be stored as per GDPR compliance (Maybe some TnC links need to be added to the registration page) Maybe #19 (closed) connects here

3. A user (contributor/maintainer) can see all their respective data points on the "My Profile" page. They should also be able to edit all the data points except email and username.

4. A user with the role "Admin" can see (but not edit) the list of all users, can activate/deactivate other users, can change the role of other users

5. Motivation text should not be editable (no update, only create) after sign-up

For specific designs and visuals and confirmation, please connect with @rostam