feat: flip swap mechanism — MD as primary, RST as override (Phase 1)

This is the first of three phases inverting the per-page swap mechanism
so MD becomes the canonical primary and RST becomes the rare override.

Phase 1 — file renames + conf.py exclude_patterns flip only:
- Rename docs/**/md-<stem>.md to docs/**/<stem>.md (drop md- prefix)
  for all 254 stems previously listed in docs/_swap.txt
- Rename docs/**/<stem>.rst to docs/**/rst-<stem>.rst (add rst- prefix)
  for the same 254 stems
- Repurpose docs/_swap.txt as docs/_rst_overrides.txt; initially empty
  comment-only since no pages need the RST fallback right now
- conf.py exclude_patterns flipped: rst-*.rst is now excluded by default
  instead of md-*.md
- conf.py runtime-artifact references updated to _rst_override_state.json
  and _md_exclude.txt (Phase 2 will rewrite swap_sources.py to produce
  these names; for now no swap script runs because overrides list is empty)

Phase 2 (next commit on this branch) will rewrite scripts/swap_sources.py
with inverted rename direction, delete scripts/import_myst.py + tests, and
update tests/test_swap_sources.py for the new semantics.

Phase 3 will be the cleanup pass and ready-for-review flip.

Generated by robots https://vyos.io

1 files changed, 61 insertions, 0 deletions

diff --git a/docs/installation/cloud/gcp.md b/docs/installation/cloud/gcp.md
new file mode 100644
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@@ -0,0 +1,61 @@
+---
+lastproofread: '2026-02-09'
+---
+
+# Google Cloud Platform
+
+## Deploy VM
+
+To deploy VyOS on Google Cloud Platform (GCP):
+
+1. Generate an SSH key pair of type **ssh-rsa** on the host that will connect
+   to VyOS.
+
+   Example:
+
+   ```none
+   ssh-keygen -t rsa -f ~/.ssh/vyos_gcp -C "vyos@mypc"
+   ```
+
+:::{note}
+The SSH key comment must begin with `vyos@` because that's the
+default VyOS user. GCP uses this value to set the username on the instance.
+:::
+
+2. Open the GCP Console and navigate to **Metadata**. Select **SSH Keys** and
+   click **Edit**.
+
+:::{figure} /_static/images/cloud-gcp-01.webp
+Click **Add item**, paste your public SSH key, and click **Save**.
+:::
+
+:::{figure} /_static/images/cloud-gcp-02.webp
+:::
+
+3. Search for "VyOS" in the Marketplace.
+4. Configure the deployment name, zone, and machine type, then click **Deploy**.
+
+:::{figure} /_static/images/cloud-gcp-03.webp
+:::
+
+5. After a few seconds, select your **instance**.
+
+:::{figure} /_static/images/cloud-gcp-04.webp
+:::
+
+6. Note your external IP address.
+
+:::{figure} /_static/images/cloud-gcp-05.webp
+:::
+
+7. Connect to the instance using the SSH key you generated in step 1.
+
+```none
+ssh -i ~/.ssh/vyos_gcp vyos@203.0.113.3
+vyos@vyos-r1-vm:~$
+```
+
+
+## References
+
+<https://console.cloud.google.com/>