docs: add CI automation guide and issue triage reference

[chrisburr]

Summary

• Add a "CI Automation" section to docs/dev/how-to/contribute.md explaining:
  • Automatic draft conversion when a reviewer requests changes
  • Daily PR review reminder digest on Mattermost
• Create new docs/dev/reference/issue-triage.md page with project management content moved from DIRACGrid/.github CONTRIBUTING.md:
  • Issue workflow states (Idea → Triage → Design → Sprint → Done) with mermaid diagram
  • GitHub Projects fields (area, priority, type, story points, sprint)
  • Issue creation guidelines for bug reports and feature requests
• Add the new page to the mkdocs nav under Developer Guide > Reference

[read-the-docs-community]

Documentation build overview

📚 diracx | 🛠️ Build #31335179 | 📁 Comparing c236e68 against latest (4fad58f)

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Show files changed (118 files in total): 📝 117 modified | ➕ 1 added | ➖ 0 deleted

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