docs: misc adds

[aj-emerich]

Summary

Draft of the Kestra 2.0 release blog post at src/contents/blogs/2026-09-01-release-2-0/index.md.

Covers all major 2.0 features in the order of their relative weight:

• MCP Tool Trigger + MCP Server
• Worker Groups 2.0
• RBAC action-based permissions
• Loop task (ForEach/ForEachItem replacement)
• Trigger when expression
• kestractl IAM commands
• Blueprint version control
• AWS EC2 Task Runner
• PurgeStorage
• Additional improvements (Reusable Inputs, ION binary, TRACEPARENT, Syslog CEF, AI Agent metrics, etc.)
• Breaking changes summary table + migration links

Before publishing

• Add author frontmatter (name, image, linkedin)
• Add main.jpg hero image
• Add any available feature screenshots (MCP server Connect tab, Worker Groups UI, etc.)
• Confirm release date is still 2026-09-01 (update frontmatter if not)
• Verify all internal doc links resolve on the merged branch
• Review the toolDescription example for accuracy against the shipped trigger
• Confirm Worker Groups fallback default flip (WAIT to FAIL) with engineering before calling it out in the post

Notes

PR targets docs/2.0.0-release so it flows through with the main docs release. When that branch merges to main, this blog goes live with it.

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