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, 27 insertions, 0 deletions

diff --git a/docs/configuration/system/proxy.md b/docs/configuration/system/proxy.md
new file mode 100644
index 00000000..286e835f
--- /dev/null
+++ b/docs/configuration/system/proxy.md
@@ -0,0 +1,27 @@
+(system-proxy)=
+
+# System Proxy
+
+Some IT environments require the use of a proxy to connect to the Internet.
+Without this configuration VyOS updates could not be installed directly by
+using the {opcmd}`add system image` command ({ref}`update_vyos`).
+
+```{cfgcmd} set system proxy url \<url\>
+
+Set proxy for all connections initiated by VyOS, including HTTP, HTTPS, and
+FTP (anonymous ftp).
+```
+```{cfgcmd} set system proxy port \<port\>
+
+Configure proxy port if it does not listen to the default port 80.
+```
+```{cfgcmd} set system proxy username \<username\>
+
+Some proxys require/support the "basic" HTTP authentication scheme as per
+{rfc}`7617`, thus a username can be configured.
+```
+```{cfgcmd} set system proxy password \<password\>
+
+Some proxys require/support the "basic" HTTP authentication scheme as per
+{rfc}`7617`, thus a password can be configured.
+```
\ No newline at end of file