Improve HTTP `cursor` documentation

[DenisCarriere]

• [ ] Improve HTTP cursor documentation
  • [ ] Using Consul KV store
  • [ ] Using HTTP server
  • [ ] Connect with Redis KV
• [ ] Extend description in CLI argument to include HTTP request example
  • (ex: PUT http://127.0.0.1:8500/v1/kv/my-key )

Reference

• https://github.com/pinax-network/substreams-sink/releases/tag/v0.13.4
• https://developer.hashicorp.com/consul/api-docs/kv