docs: Fix table of contents in summary
- [Terminology](concepts.md#terminology)
- [Rules](concepts.md#rules)
- [Rules REST API](concepts.md#rules-rest-api)
- - [Rules CLI API](#rules-cli-api)
+ - [Rules CLI API](concepts.md#rules-cli-api)
- [Deployment](deployment.md#deployment)
- [Gateway](deployment.md#gateway)
- [Sidecar](deployment.md#sidecar)
