Fix: remove email and update Discord link from error boundary

[iamacook]

What it solves

Resolves #3220

How this PR fixes it

The <ErrorBoundary> component was updated to remove the email address and update the Discord invitation link.

How to test it

Trigger the app to crash and observe no email link and an updated Discord link.

Screenshots

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[coveralls]

Pull Request Test Coverage Report for Build 1648843229

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 32.273%

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Totals
Change from base Build 1616257116:	0.0%
Covered Lines:	3085
Relevant Lines:	8492

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💛 - Coveralls

[github-actions]

Deployment links

🟠 Safe Rinkeby	⚪ Safe Mainnet	🟣 Safe Polygon	🟡 Safe BSC	⚫ Safe Arbitrum	🟢 Safe xDai

[github-actions]

E2E Tests Failed
Check the results here: https://github.com/gnosis/safe-react-e2e-tests/actions/runs/1648867293

Failed tests:

• ❌ Safe Apps List Safe Apps List

[katspaugh]

Thanks!

[katspaugh]

It can't be tested on this branch because we only show the link on prod.
Tested locally. ✅