doc: bazel downloader (#3519)

[romanofski]

This adds documentation on how to configure the Bazel downloader in order to work with network isolated registries.

Fixes #3519

[gemini-code-assist]

Summary of Changes

Hello @romanofski, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive documentation for configuring the Bazel downloader within rules_python. It addresses the challenge of fetching Python dependencies in environments with network restrictions by detailing how to redirect downloads to internal registries, thereby improving flexibility and compliance for users operating in such setups.

Highlights

• Bazel Downloader Documentation: New documentation has been added to explain how to configure the Bazel downloader for rules_python to work with network-isolated registries, providing guidance on redirecting Python dependency downloads.

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[gemini-code-assist]

Code Review

This pull request adds valuable documentation on configuring the Bazel downloader for use in network-isolated environments. The example and explanations are helpful. I've suggested a couple of minor text changes to improve clarity and fix a grammatical error.