Rewrite README and add canonical CLI/config documentation

docs/config/config-yml.md

@@ -1,48 +1,5 @@
-# Main `config.yml`
+# Moved
 
-`config.yml` defines application-level defaults used by CLI commands.
+This page has moved.
 
-By default, Scriptorium looks for `/usr/local/etc/scriptorium/config.yml` and, if not present, then for `/etc/scriptorium/config.yml`. You can also pass `--config PATH`.
-
-## Complete Example
-
-```yaml
-prompt_dir: ./prompts
-profile_dir: ./profiles
-schema_dir: ./schemas
-
-server:
-  addr: :8080
-
-defaults:
-  render_format: text
-```
-
-## Available Options
-
-- `prompt_dir` (optional): Default directory for prompt definition YAML files.
-- `profile_dir` (optional): Default directory for execution profile YAML files.
-- `schema_dir` (optional): Base directory for JSON schema files used by `json_schema` validation.
-
-### `server`
-
-- `addr` (optional): HTTP server listen address for `scriptorium serve`.
-
-### `defaults`
-
-- `render_format` (optional): Default output format for `scriptorium render`.
-- Allowed values: `text`, `json`.
-
-## Precedence
-
-For run/render/serve settings, precedence is:
-
-1. Explicit CLI flags
-2. `config.yml`
-3. Built-in defaults
-
-## Notes and Rules
-
-- Unknown YAML fields fail to load (strict decoding).
-- This file does not accept API keys.
-- `config.yml` sets directory/server defaults only; prompt/profile content remains in their own files.
+Use the canonical configuration reference: [../config.md](../config.md).