GP-609: Updated documentation to bring attention to publicly document…

[mauteri]

…ed resource (github) for project.

Description of the Change

Closes #609

How to test the Change

Changelog Entry

Added - New feature
Changed - Existing functionality
Deprecated - Soon-to-be removed feature
Removed - Feature
Fixed - Bug fix
Security - Vulnerability

Credits

Props @mauteri

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[what-the-diff]

PR Summary

• Included Project's Repository Link
  With this update, we have added a link to the primary repository for the GatherPress project directly. This ensures easier navigation and access for users and potential contributors alike.

• Open Invitation to Contribute
  The pull request also added a comment encouraging contribution to the GatherPress project from others. This essentially enhances the project's collaborative and inclusive environment, allowing for continuous improvements based on communal input.