Describe what's missing in our docs

As discussed @aj-emerich, let's:

• adjust the README https://github.com/kestra-io/client-sdk/tree/main to redirect to https://kestra.io/docs/api-reference/kestra-sdk instead of duplicating the information
• refine https://kestra.io/docs/api-reference/kestra-sdk to 1 page per language
  • change to Release 1.0 as the first stable release
  • 1 page per language covering:
    • how to install that SDK - the README is mostly correct https://github.com/kestra-io/client-sdk/tree/main
      • pip install kestrapy
      • npm install @kestra-io/kestra-sdk
      • go get [github.com/kestra-io/client-sdk/go-sdk@latest](http://github.com/kestra-io/client-sdk/go-sdk@latest)
    • how to authenticate i.e. instantiate the client with the Configuration() object
      • 1 sub-section per authentication method (username + password, another section for API token authentication in EE/Cloud)
    • how to create or update a flow if it already exists
    • how to execute a flow
    • how to follow the execution i.e. wait for results (server-sent event = SSE) → Yann should send an example to AJ as this is a custom endpoint not covered by the autogenerated SDK
      • wait=true will poll for the status every X seconds etc; in contrast, the follow endpoint uses SSE to stream logs/progress in real-time → **get** /api/v1/{tenant}/executions/{executionId}/follow and **get** /api/v1/{tenant}/logs/{executionId}/follow
    • then how to list all flows from the tutorial namespace with filters