* feat: add config subcommand to generate default config files

- Add 'gate config' subcommand to output default configuration templates
- Support multiple config types: full, minimal, simple, lite, bedrock
- Add --write flag to write directly to config.yml
- Embed config files using go:embed for distribution
- Add sync-configs Makefile target and go:generate directives
- Update documentation with config generation examples and templates

* docs: update quick-start guide for configuration file generation

- Change wording from "default configuration file" to "simple configuration file" for clarity.
- Update command example to reflect the new syntax for generating a simple configuration file with the `-t simple -w` flags.

* docs: update configuration menu item text for clarity

- Changed menu item text from "Complete Configuration" to "Configuration & Templates" to better reflect the content.