Get discord link on the /intro page #900

Issue Description

When superusers visit the /intro page, they see details filled out by new users. Below this information, there should be a text box where superusers can provide feedback to the new users based on the acceptance or rejection of their applications.

When the user who filled out the page sees the /intro page, they see the status of their application:

• When their application is under review:
  We are reviewing your application. Please check again here periodically for an update.

• When their application is rejected:
  Line 1 - Unfortunately, at this time, your application is not approved.
  Line 2 - [Insert feedback note from superuser]

• When their application is accepted:
  The page should display a Discord server link for RDS, allowing them to join the server.
  Line 1- Congratulations. You've been approved to join our Discord server using this link: <Link>
  Line 2 - [Insert feedback note from superuser]

Expected Behavior

• Superusers can provide feedback on the /intro page after reviewing a new user's application.
• New users can see the status of their application on the /intro page.
• Upon acceptance, new users receive a Discord server link to join the server.

Current Behavior

Screenshots

Reproducibility

• This issue is reproducible
• This issue is not reproducible

Steps to Reproduce

1. Log in as a superuser and visit the /intro page.
2. Review a new user's application.
3. Provide feedback in the text box.
4. Log in as a new user and visit the /intro page.
5. Check the status of the application and, if accepted, verify the presence of the Discord server link.

Severity/Priority

• Critical
• High
• Medium
• Low

Additional Information

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.