Update Blog and Documentation to reflect latest changes to FlowFuse Expert and MCP nodes

[sumitshinde-84]

Description

Related Issue(s)

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 69.6%, saving 1.6 MB.

Filename	Before	After	Improvement	Visual comparison
src/blog/2025/10/images/ff-auth.png	444.9 KB	121.6 KB	72.7%	View diff
src/node-red/flowfuse/images/ff-expert-in-editor.png	435.1 KB	116.7 KB	73.2%	View diff
src/node-red/flowfuse/images/ff-expert-at-platform-level.png	409.2 KB	114.8 KB	71.9%	View diff
src/node-red/flowfuse/images/ff-expert-opned-platform.png	486.0 KB	205.7 KB	57.7%	View diff
src/node-red/flowfuse/images/ff-expert-opened.png	376.4 KB	100.2 KB	73.4%	View diff
src/blog/2025/10/images/mcp-tools.png	184.2 KB	50.6 KB	72.5%	View diff

2 images did not require optimisation.

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✅ Deploy Preview for flowforge-website ready!

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Lighthouse	1 paths audited Performance: 84 (🟢 up 22 from production) Accessibility: 80 (no change from production) Best Practices: 100 (🟢 up 8 from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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[Steve-Mcl]

good stuff