Add a how to guide showing how to dynamically create flows

[anna-geller]

Description

So far, we have this guide from Antoine showing how they dynamically generate a bunch of flows via Terraform: https://kestra.io/docs/how-to-guides/terraform-templating + https://kestra.io/docs/how-to-guides/terraform-modules-for-triggers

We could add a page "How to dynamically generate flows" which shows 2 other ways to create flows dynamically:

1. A cookie-cutter flow providing flow template, filling in values from inputs and creating flows dynamically based on provided inputs
2. Direct API calls in the style how we did it e.g. for dbt to create kestra task per each dbt model dynamically https://github.com/kestra-io/dbt-example/tree/demo

curl -X POST http://localhost:8080/api/v1/flows/import -F fileUpload=@generate_flow_with_dbt_dag.yaml
curl -X POST http://localhost:8080/api/v1/executions/company.datateam.dbt/generate_flow_with_dbt_dag?wait=true