Add API keys button and alert message configuration

[tom2drum]

Description and Related Issue(s)

Adds configuration for API keys button and alert message on API docs page.

Additional Information

• Introduced NEXT_PUBLIC_ACCOUNT_API_KEYS_BUTTON to control the visibility of the "Add API key" button, allowing it to be a boolean or a URL.
• Added NEXT_PUBLIC_API_DOCS_ALERT_MESSAGE for custom alerts on the API documentation page.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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