docs: add descriptive alt text to 2025 Annual Review images

[peterish8]

Description

• Added descriptive altOnly attributes to all 14 images in the 2025 Annual Review blog post
• Each alt text describes the chart content (data points, trends, key statistics) for screen reader users
• Improves WCAG 2.1 accessibility compliance (Success Criterion 1.1.1 - Text Alternatives)
• Alt text now provides meaningful descriptions instead of falling back to captions

Related issue(s)
Fixes #5022

Summary by CodeRabbit

• Documentation
  • Enhanced accessibility of the 2025 annual summary blog post by adding descriptive alternative text to multiple charts and visualizations, including data from Slack, social media, YouTube, newsletters, analytics, GitHub, and NPM. This improves the experience for users with screen readers and those unable to view images directly.

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📝 Walkthrough

Walkthrough

This change adds descriptive alt text to Figure components throughout the 2025 annual summary blog post by introducing the altOnly attribute to charts covering Slack, social media, YouTube, newsletters, analytics, GitHub, and NPM metrics. No structural or data modifications were made beyond including accessibility attributes.

Changes

Cohort / File(s)	Summary
Accessibility Enhancement markdown/blog/2025-annual-summary.md	Added altOnly attributes with descriptive alt text to multiple Figure components representing various analytics and platform metrics charts for improved accessibility and screen reader support.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit hops through blog posts bright,
Adding altOnly for better sight,
Charts now sing with words so clear,
Screen readers dance and cheers we hear! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title directly and accurately describes the main change: adding descriptive alt text to images in the 2025 Annual Review blog post.
Linked Issues check	✅ Passed	The PR successfully addresses issue #5022 by adding altOnly attributes with descriptive alt text to all images in the 2025 Annual Review blog post, improving WCAG 2.1 accessibility compliance.
Out of Scope Changes check	✅ Passed	All changes are scoped to adding alt text attributes to images in the 2025 Annual Review blog post as required by issue #5022; no unrelated modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (35abd54) to head (be6ae67).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #5041   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines          796       796           
  Branches       146       146           
=========================================
  Hits           796       796           

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[asyncapi-bot]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	37
🟢 Accessibility	98
🟢 Best practices	92
🟢 SEO	100
🔴 PWA	33

Lighthouse ran on https://deploy-preview-5041--asyncapi-website.netlify.app/