feat(swap): import .md files and webp transition from myst/current

Selective import from origin/myst/current (cf9c9b34):
- Add/update 255 .md files (full MyST conversion plus webp ref updates)
- Delete 175 PNG/JPG from docs/_static/images (webp twins already present)
- Delete 5 autotest topology.png (webp twins already present)

Preserved on swap (untouched):
- All .rst files (incremental swap pattern)
- conf.py, _ext/, _include/*.txt, .gitignore
- 115 canary md-*.md files
- 7 superpowers/specs/*.md design docs
- Logos vyos-logo.png / vyos-logo-icon.png (referenced by conf.py)

🤖 Generated by [robots](https://vyos.io)

1 files changed, 45 insertions, 0 deletions

diff --git a/docs/contributing/cla.md b/docs/contributing/cla.md
new file mode 100644
index 00000000..01323111
--- /dev/null
+++ b/docs/contributing/cla.md
@@ -0,0 +1,45 @@
+---
+lastproofread: '2025-12-05'
+---
+
+(cla)=
+
+# Contributor License Agreement
+
+Before we can accept your contributions to VyOS, you must sign a **Contributor
+License Agreement (CLA)**.
+
+This is a standard open-source practice that protects both you and the project.
+
+The process is straightforward and fully automated:
+
+1. **Review the CLA document**
+
+   Find the CLA text in our
+   [GitHub repository](https://github.com/vyos/vyos-cla-signatures/).
+
+2. **Submit a pull request**
+
+   When you open a pull request, a CLA bot automatically checks whether all
+   commit authors have signed the CLA.
+
+3. **Follow the bot's instructions**
+
+   If the CLA has not been signed, the bot leaves a comment with instructions.
+   Reply to that comment with the suggested text to sign the CLA.
+
+4. **Wait for confirmation**
+
+   The CLA bot verifies your response and updates the pull request status.
+   Once all commit authors have signed, the bot confirms that the CLA
+   requirement is met and unlocks the pull request for merging.
+
+:::{note}
+Each commit author must sign the CLA.
+
+If your pull request includes commits from multiple contributors, each one
+must sign the CLA before the pull request can be accepted.
+:::
+
+Once you sign the CLA, it remains valid for all your past and future
+contributions to VyOS under the same GitHub identity.