docs: correct discord link in README.md

[JefferMarcelino]

Related Issue

• Fixes broken link in the README.md

Closes: #532

Describe the changes you've made

• I updated the README.md to fix a broken link to the Discord server.

Type of change

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update.
• This change requires a documentation update

How Has This Been Tested?

I have verified the changes by following the link in updated README.md and confirming that the Discord link now works as expected.

Checklist

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented on my code, particularly wherever it was hard to understand.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• Any dependent changes have been merged and published in downstream modules.

Screenshots (if applicable)

N/A

Code of Conduct

• I agree to follow this project's Code of Conduct

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