[Feature Request] Provide recipe for OpenAI when using Commitizen CLI + cz-git setup

[jaklan]

💭 Describe the feature

Hi, at the moment docs related to OpenAI integration focus on a scenario when you use czg CLI tool. I wish we have a better description how to work with the integration when we use Commitizen CLI + cz-git setup, similar to the one you provided in the original issue:

commitizen + cz-git:

• if setting export CZ_OPENAI_TOKEN="xxxx" on .zshrc and .bashrc

  • czai=1 cz: Turn on openAI generate subject mode
  • if useAI is true just run cz or git cz

• if none setting .zshrc or .bashrc can use:

  • CZ_OPENAI_TOKEN="xxxx" czai=1 cz or CZ_OPENAI_TOKEN="xxxx" openai=1 git cz

so I would especially highlight the fact that we have 3 ways to set up the OpenAI key:

• npx czg --api-key=sk-xxxxx
• CZ_OPENAI_API_KEY="sk-xxxxx" cz
• export CZ_OPENAI_API_KEY="sk-xxxxx" in .zshrc / .bashrc

and 2 ways to trigger commitizen with AI:

• czai=1 cz
• useAI: true in config -> cz