docs: add Section/Order front-matter so the nav is built from the files (drop a page in, it appears — no code change)

wiki/commands.md

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+Order: 10
+
 # Slash commands
 
 Type these in the composer. Anything not starting with `/` is sent as a message.

wiki/formatting.md

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+Order: 20
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 # mIRC formatting
 
 Orbit renders and lets you compose classic IRC formatting. Use the composer's toolbar (**B** / *I* /

wiki/orbit-channel.md

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+Order: 40
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 # The #orbit channel & bot
 
 **#orbit** is the project's live IRC channel. A bot named **`Pulsar`** stays connected there and does

wiki/themes.md

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+Order: 30
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 # Themes
 
 Switch in **Settings → Appearance**. Four themes ship with Orbit:

wiki/troubleshooting.md

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+Order: 50
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 # Troubleshooting
 
 ## "Connexion fermée" / the socket closes immediately