docs: Direct readers to the CNCF slack for contributions

[kostis-codefresh]

Signed-off-by: Kostis Kapelonis [email protected]

People that want to write code and contribute will find help quicker in the argo-contributors channel instead of the gitops one (which is more high level)

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov[bot]]

Codecov Report

Base: 55.75% // Head: 55.75% // No change to project coverage :thumbsup:

Coverage data is based on head (25a3700) compared to base (917f5a0). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #504   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files          41       41           
  Lines        4525     4525           
=======================================
  Hits         2523     2523           
  Misses       1808     1808           
  Partials      194      194           

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