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, 48 insertions, 0 deletions

diff --git a/docs/troubleshooting/system.md b/docs/troubleshooting/system.md
new file mode 100644
index 00000000..e855e385
--- /dev/null
+++ b/docs/troubleshooting/system.md
@@ -0,0 +1,48 @@
+# System Information
+
+(boot-steps)=
+
+## Boot Steps
+
+VyOS 1.2 uses [Debian Jessie] as the base Linux operating system. Jessie was
+the first version of Debian that uses [systemd] as the default init system.
+
+These are the boot steps for VyOS 1.2
+
+1. The BIOS loads Grub (or isolinux for the Live CD)
+2. Grub then starts the Linux boot and loads the Linux Kernel `/boot/vmlinuz`
+3. Kernel Launches Systemd `/lib/systemd/systemd`
+4. Systemd loads the VyOS service file
+   `/lib/systemd/system/vyos-router.service`
+5. The service file launches the VyOS router init script
+   `/usr/libexec/vyos/init/vyos-router` - this is part of the [vyatta-cfg]
+   Debian package
+
+> 1. Starts [FRR] - successor to [GNU Zebra] and [Quagga]
+> 2. Initialises the boot configuration file - copies over
+>    `config.boot.default` if there is no configuration
+> 3. Runs the configuration migration, if the configuration is for an older
+>    version of VyOS
+> 4. Runs The pre-config script, if there is one
+>    `/config/scripts/vyos-preconfig-bootup.script`
+> 5. If the config file was upgraded, runs any post upgrade scripts
+>    `/config/scripts/post-upgrade.d`
+> 6. Starts `rl-system` and `firewall`
+> 7. Mounts the `/boot` partition
+> 8. The boot configuration file is then applied by `/opt/vyatta/sbin/vyatta-boot-config-loader/opt/vyatta/etc/config/config.boot`
+>
+> > 1. The config loader script writes log entries to
+> >    `/var/log/vyatta-config-loader.log`
+>
+> 09. Runs `telinit q` to tell the init system to reload `/etc/inittab`
+> 10. Finally it runs the post-config script
+>     `/config/scripts/vyos-postconfig-bootup.script`
+
+[debian jessie]: https://www.debian.org/releases/jessie/
+[frr]: https://frrouting.org/
+[gnu zebra]: https://www.gnu.org/software/zebra/
+[pcap filter expressions]: http://www.tcpdump.org/manpages/pcap-filter.7.html
+[quagga]: https://www.quagga.net/
+[systemd]: https://freedesktop.org/wiki/Software/systemd/
+[tshark]: https://www.wireshark.org/docs/man-pages/tshark.html
+[vyatta-cfg]: https://github.com/vyos/vyatta-cfg