Docs: update Ecosystem section

[huynhicode]

📑 Summary

This PR updates the Ecosystem section of the Mermaid JS docs.

Updates:

• add "Mermaid Chart" page
• separate Integrations page into two pages ("Integrations - community" and "Integrations - create")
• remove "Showcase" page
• minor verbiage updates
• content formatting

As a follow-up to this PR, it would be nice to add descriptions to the list of community plugins/integrations as not everyone who views the list will have knowledge about all the tools/technologies.

Also, a check to make sure all links are current.

Resolves # n/a

📏 Design Decisions

Design decisions come from within the Mermaid Chart org.

Screenshots:

📋 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.
• 🔖 targeted develop branch

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[knsv]

This looks great! Thank you Steph!

[sidharthv96]

Please add the changed urls here so that old links don't break.

mermaid/packages/mermaid/src/docs/.vitepress/theme/redirect.ts

Lines 85 to 93 in 07f460a

	const urlRedirectMap: Record<string, string> = {
	// Old URL: New URL
	'/misc/faq.html': 'configure/faq.html',
	'/syntax/c4c.html': 'syntax/c4.html',
	'/config/n00b-advanced.html': 'config/advanced',
	'/intro/n00b-gettingStarted.html': 'intro/getting-started',
	'/intro/n00b-syntaxReference.html': 'intro/syntax-reference',
	'/community/n00b-overview.html': 'intro/getting-started',
	};

[huynhicode]

Please add the changed urls here so that old links don't break.

mermaid/packages/mermaid/src/docs/.vitepress/theme/redirect.ts

Lines 85 to 93 in 07f460a

	const urlRedirectMap: Record<string, string> = {
	// Old URL: New URL
	'/misc/faq.html': 'configure/faq.html',
	'/syntax/c4c.html': 'syntax/c4.html',
	'/config/n00b-advanced.html': 'config/advanced',
	'/intro/n00b-gettingStarted.html': 'intro/getting-started',
	'/intro/n00b-syntaxReference.html': 'intro/syntax-reference',
	'/community/n00b-overview.html': 'intro/getting-started',
	};

Done - thanks!

[codecov]

Codecov Report

Merging #4817 (8a0ca8c) into master (14c1c1c) will decrease coverage by 0.46%.
Report is 158 commits behind head on master.
The diff coverage is 68.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4817      +/-   ##
==========================================
- Coverage   73.93%   73.47%   -0.46%     
==========================================
  Files         145      146       +1     
  Lines       14653    14569      -84     
  Branches      562      592      +30     
==========================================
- Hits        10834    10705     -129     
- Misses       3706     3727      +21     
- Partials      113      137      +24     

Flag	Coverage Δ
e2e	79.02% <75.42%> (-0.44%)	⬇️
unit	45.55% <41.26%> (-0.56%)	⬇️

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

Files Changed	Coverage Δ
packages/mermaid/src/diagrams/c4/c4Diagram.ts	100.00% <ø> (ø)
packages/mermaid/src/diagrams/c4/svgDraw.js	87.65% <ø> (ø)
packages/mermaid/src/diagrams/class/classDb.ts	82.35% <ø> (-0.54%)	⬇️
...ages/mermaid/src/diagrams/class/classDiagram-v2.ts	60.00% <ø> (ø)
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	79.85% <ø> (ø)
...s/mermaid/src/diagrams/flowchart/flowDiagram-v2.ts	75.00% <ø> (ø)
...ackages/mermaid/src/diagrams/gantt/ganttDiagram.ts	100.00% <ø> (ø)
...ckages/mermaid/src/diagrams/git/gitGraphDiagram.ts	100.00% <ø> (ø)
packages/mermaid/src/diagrams/pie/pieDiagram.ts	100.00% <ø> (ø)
...aid/src/diagrams/quadrant-chart/quadrantDiagram.ts	100.00% <ø> (ø)
... and 35 more

... and 9 files with indirect coverage changes

[sidharthv96]

@huynhicode, as showcases was removed, that should also be added to the redirect.

[huynhicode]

@huynhicode, as showcases was removed, that should also be added to the redirect.

Done, thanks!