Make documentation Cosmos-version aware

[tatiana]

Context

As of December 2023, we are hosting Cosmos docs as a Github page, built out of Cosmos main branch.

The consequence is that the documentation, many times, is ahead of the features available in the latest stable releases. Additionally, users need help seeing the documentation relative to a specific version of Cosmos.

Some tools support documentation based on the source code version, such as ReadTheDocs:
https://readthedocs.com/

Since Airflow and other Astronomer projects use this tool, it should be straightforward to adopt it.

Acceptance criteria

• Users can see what the Cosmos version associated with a specific documentation page
• Users can check the documentation for a specific version of Cosmos

[dosubot]

🤖

That's a great idea! Versioned documentation would definitely be a valuable addition to Cosmos. It's important for users to have access to documentation that aligns with the specific version they are using. Implementing this feature would greatly improve the user experience and make it easier for users to find relevant information. If you're considering working on this, it could be a significant contribution to the project. Keep up the good work!

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