Point users to the GitHub discussion board.

[joaander]

Description

Replace the signac-support email address and slack link with a link to the signac discussion board.

Checklist:

• I am familiar with the Contributing Guidelines.
• I agree with the terms of the Contributor Agreement.
• My name is on the list of contributors.
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• The package documentation and framework documentation in signac-docs are up to date with these changes.
• I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.01%. Comparing base (3f74177) to head (39efd23).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1002      +/-   ##
==========================================
- Coverage   86.09%   86.01%   -0.09%     
==========================================
  Files          20       20              
  Lines        3503     3503              
  Branches      770      770              
==========================================
- Hits         3016     3013       -3     
- Misses        330      333       +3     
  Partials      157      157              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.