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, 48 insertions, 0 deletions

diff --git a/docs/troubleshooting/system.md b/docs/troubleshooting/system.md
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+# 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