Updating all Community Slack references to Discord

[PhillypHenning]

Description

Updating references to the Community Slack to the newly created Community Discord

Type of change

• Documentation update

How Has This Been Tested?

Viewed all changes locally

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[runforesight]

Foresight Summary

    
Major Impacts
Foresight hasn't detected any major impact on your workflows and tests.

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✅  CI workflow has finished in 38 seconds and finished at 17th Feb, 2023.

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Job	Failed Steps	Tests
lint-black	-     🔗	N/A	See Details
lint-pylint	-     🔗	N/A	See Details

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