docs: add CLI usage documentation

Generates and formats the help documentation for the `llm-cli` command-line interface using Typer and Prettier.

docs/help.md

@@ -0,0 +1,69 @@
+# `llm-cli`
+
+**Usage**:
+
+```console
+$ llm-cli [OPTIONS] COMMAND [ARGS]...
+```
+
+**Options**:
+
+- `--help`: Show this message and exit.
+
+**Commands**:
+
+- `commit`
+- `repo`
+
+## `llm-cli commit`
+
+**Usage**:
+
+```console
+$ llm-cli commit [OPTIONS]
+```
+
+**Options**:
+
+- `--help`: Show this message and exit.
+
+## `llm-cli repo`
+
+**Usage**:
+
+```console
+$ llm-cli repo [OPTIONS] COMMAND [ARGS]...
+```
+
+**Options**:
+
+- `--help`: Show this message and exit.
+
+**Commands**:
+
+- `description`
+- `topics`
+
+### `llm-cli repo description`
+
+**Usage**:
+
+```console
+$ llm-cli repo description [OPTIONS]
+```
+
+**Options**:
+
+- `--help`: Show this message and exit.
+
+### `llm-cli repo topics`
+
+**Usage**:
+
+```console
+$ llm-cli repo topics [OPTIONS]
+```
+
+**Options**:
+
+- `--help`: Show this message and exit.

scripts/gen-help.sh

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+#!/bin/bash
+set -o errexit -o nounset -o pipefail
+
+typer llm_cli utils docs --output docs/help.md
+prettier --write docs/help.md