doc: reduce version selector entries and introduce archive page

[onefloid]

Description

The current version selector includes every created version, which will soon make navigation cluttered and harder to use.

Desired behavior:

• The version selector should only include:

  1. The previous major version (e.g. v2.x)

  2. The last three minor releases of the current major version

  3. For each minor version, only the latest patch (micro) release

• Older versions should remain accessible but should not appear in the selector.

Additionally, there is currently no centralized overview of all available versions.

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Proposed Solution

• Filter visible versions during deployment

• Implement version selection logic

• Add an archive page listing all available versions