feat: Generate binary documentation

Also refactors main.rs/mod.rs to silence clippy

docs/server_reference.md

@@ -0,0 +1,21 @@
+# Command-Line Help for `continuwuity`
+
+This document contains the help content for the `continuwuity` command-line program.
+
+**Command Overview:**
+
+* [`continuwuity`↴](#continuwuity)
+
+## `continuwuity`
+
+a very cool Matrix chat homeserver written in Rust
+
+**Usage:** `continuwuity [OPTIONS]`
+
+###### **Options:**
+
+* `-c`, `--config <CONFIG>` — Path to the config TOML file (optional)
+* `-O`, `--option <OPTION>` — Override a configuration variable using TOML 'key=value' syntax
+* `--read-only` — Run in a stricter read-only --maintenance mode
+* `--maintenance` — Run in maintenance mode while refusing connections
+* `--execute <EXECUTE>` — Execute console command automatically after startup