Allow users to add GitHub username and repository name through UI

[KBandipo]

Issue description

The app currently lacks the ability for users to enter their GitHub username and repository name through the UI. Implementing this functionality will allow users to input their GitHub details directly.

Steps to reproduce the issue

1. Use the @collabo-user GitHub access token in the .env of the api-server.
2. Use the use-me-for-experiments repo in your .env's REPO_API_URL.
3. Follow every other directions added in Collabocate's local development instructions.
4. Run both the collabocate client and api servers.
5. Go to collabocate's UI interface, observe that there's no option to enter the GitHub username or repo name through the UI.

Expected behavior

Users should be able to enter their GitHub username and repository name directly through the UI

Screenshots

Additional context

Repo URL: https://github.com/collabo-community/collabocate

Testing checklist

Note (to contributor taking on this task assignment): Add the testing checklist below (without this note) to your pull request when submitting your fix. This will guide (you and) the contributors who will review your fix to know what is important to check or test for.

• The UI allows users to enter their GitHub username.
• The UI allows users to input their repository name.
• I certify that I ran my checklist