Update Slack links

[merobi-hub]

Problem

Evidently the Slack link expired again.

Solution

This updates the links across the project and docs with a new bitly link to a permanent invite. So hopefully we won't have to do this again for a long time if ever.

Please describe your change as it relates to the problem, or bug fix, as well as any dependencies. If your change requires a database schema migration, please describe the schema modification(s) and whether it's a backwards-incompatible or backwards-compatible change.

Note: All database schema changes require discussion. Please link the issue for context.

One-line summary: Updates the slack links.

Checklist

• [x ] You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• [x ] You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[netlify]

✅ Deploy Preview for peppy-sprite-186812 canceled.

Name	Link
🔨 Latest commit	48ae981
🔍 Latest deploy log	https://app.netlify.com/sites/peppy-sprite-186812/deploys/664787651238f60008406fb8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.57%. Comparing base (1aeab0c) to head (46f95e3).

❗ Current head 46f95e3 differs from pull request most recent head 48ae981

Please upload reports for the commit 48ae981 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2815   +/-   ##
=========================================
  Coverage     84.57%   84.57%           
  Complexity     1441     1441           
=========================================
  Files           251      251           
  Lines          6503     6503           
  Branches        302      302           
=========================================
  Hits           5500     5500           
  Misses          850      850           
  Partials        153      153           

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