Add explorer to explorer list

[DaWe35]

Added https://explorer.coolhd.hu to the explorer list.

Description

Added this open source explorer to the list:

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	68932f4
🔍 Latest deploy log	https://app.netlify.com/sites/ethereumorg/deploys/675c90ca82b55a0008bd7fec
😎 Deploy Preview	https://deploy-preview-14505--ethereumorg.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 49 (🔴 down 7 from production) Accessibility: 92 (no change from production) Best Practices: 87 (🔴 down 11 from production) SEO: 98 (no change from production) PWA: - View the detailed breakdown and full score reports

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[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

Since your pull request originates from a forked repository, GitGuardian is not able to associate the secrets uncovered with secret incidents on your GitGuardian dashboard.
Skipping this check run and merging your pull request will create secret incidents on your GitGuardian dashboard.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
-	-	Generic High Entropy Secret	602d37b	src/data/community-events.json	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

If this detection is a false positive, please contact Oleh Vasylenko (@Aldekein) to fix it in the GitGuardian dashboard.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[DaWe35]

hello

[DaWe35]

Do you need a maintainer?