Fix - User to not submit the join form even if user goes to that route

[satyam73]

Issue Description

As of now user can go to join route and fill and submit the form to get the /intro link of their application, which shouldn't be the case.

Expected Behavior

Fix to not submit the join form even if user goes to that route.

Current Behavior

As of now user can go to join route and fill and submit the form to get the /intro link of their application, which shouldn't be the case.

Screenshots

n/a

Reproducibility

• [ ] This issue is reproducible
• [ ] This issue is not reproducible

Steps to Reproduce

• Go to /join route manually.
• Fill the form and you will be able to submit.

Severity/Priority

• [ ] Critical
• [ ] High
• [ ] Medium
• [ ] Low

Additional Information

n/a

Checklist

• [ ] I have read and followed the project's code of conduct.
• [ ] I have searched for similar issues before creating this one.
• [ ] I have provided all the necessary information to understand and reproduce the issue.
• [ ] I am willing to contribute to the resolution of this issue.