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I updated README.md. Summary of changes (concise):
Added "Contents summary" — outlines typical repo directories and purpose.
Added "Getting started (clone)" — HTTPS and SSH git clone commands.
Added "Raise a Pull Request (typical workflow)" — step-by-step branch, commit, push, PR guidance and PR description checklist.
Added "Local preview and testing" — instructions to check CONTRIBUTING.md and example commands for running a local preview.
Expanded "Contributing & support" — brief contribution guidelines.
Added "Useful links" — links to repo, live docs, issues, templates, discussions, and local paths.
Added "Development details (local setup)" — example local setup for Hugo, MkDocs, and Docker.
Added "Branch & commit conventions" — branch naming and commit message guidance (Conventional Commits example).
Added "CI, linters & checks" — note about CI pipelines and pre-PR checks.
Added "Reporting security issues" — guidance to avoid public issues and reference to GitHub security advisories.
Added "License" — pointer to the LICENSE file.