Orbit documentation: docs, wiki and FAQ pages

wiki/orbit-channel.md

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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
+two things.
+
+## Commit announcements
+
+Every push to the project's git server, Pulsar posts a GitHub-style summary to #orbit, with mIRC colours:
+
+```
+[orbit] alice pushed 2 commits to main [+0/-0/±2] https://…/compare/abc…def
+[orbit] alice 1a2b3c4 - Fix a thing
+[orbit] alice 5d6e7f8 - Add another thing
+```
+
+## Interactive commands
+
+Talk to the bot in-channel or by PM (the `!` prefix):
+
+| Command | Reply |
+|---------|-------|
+| `!help` | List of commands. |
+| `!about` | What Orbit is + link. |
+| `!commits [n]` | The latest commits, live from the repo. |
+| `!stats` / `!version` | Repo stats / current version. |
+| `!source` / `!app` | Repo and live-client links. |
+| `!account <nick>` | Whether a nick is a registered account. |
+| `!uptime` / `!ping` | Bot status. |
+
+The bot is a Django management command, so `!account` reads the real account database. Join it from
+the client: [open #orbit](https://tchatou.fr/app/?channel=%23orbit).