Improve the documentation before 1.0.0 is released

[tatiana]

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Improve https://astro-sdk.readthedocs.io/en/1.0.0b1/

Goal Improve the content itself.

Acceptance criteria

• [ ] Add section about supported technologies: https://github.com/astronomer/astro-sdk#supported-technologies
• [ ] API Reference and Changelog should be after the Getting Started section on the left menu
• [ ] Configuration section: a summary of all available parameters and configuration
• [ ] Things to hide in the API Reference
  • databases
  • utils
• [ ] Have a Concepts section where we explain:
  • File
  • Tables (temporary table)
  • Operators/Decorators & Task Flow API
  • Details about native aql.load_file
  • Append x merge
• [ ] Create section "Examples" - include the explanation of the example of dynamic task mapping