docs: Add a note about installing the compressed file for the CLI

[tampakrap]

Since v1.18.0 there are compressed files available under the bundle/ directory in releases.crossplane.io. This commit adds the functionality of downloading the compressed file and unpacking it, instead of downloading the binary, which would save some bandwidth.

This commit documents this functionality.

Related PR: https://github.com/crossplane/crossplane/pull/6436

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