Update Discord links

[huynhicode]

📑 Summary

Base branch set to master.

This PR updates the Discord invite link. Current Discord invite is invalid.

Resolves # 6137

📏 Design Decisions

n/a

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

[changeset-bot]

⚠️ No Changeset found

Latest commit: fa6f3e5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[netlify]

✅ Deploy Preview for mermaid-js ready!

Name	Link
🔨 Latest commit	fa6f3e5
🔍 Latest deploy log	https://app.netlify.com/sites/mermaid-js/deploys/676496a47b8d840008f044b6
😎 Deploy Preview	https://deploy-preview-6144--mermaid-js.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 4.49%. Comparing base (becadf0) to head (fa6f3e5).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ermaid/src/docs/.vitepress/components/HomePage.vue	0.00%	1 Missing ⚠️
packages/mermaid/src/docs/.vitepress/config.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #6144      +/-   ##
=========================================
+ Coverage    4.48%   4.49%   +0.01%     
=========================================
  Files         382     382              
  Lines       54027   53904     -123     
  Branches      621     621              
=========================================
  Hits         2425    2425              
+ Misses      51602   51479     -123     

Flag	Coverage Δ
unit	4.49% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ermaid/src/docs/.vitepress/components/HomePage.vue	0.00% <0.00%> (ø)
packages/mermaid/src/docs/.vitepress/config.ts	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes