chore(docs): remove duplicate bzlmod guidance

[alexeagle]

It's out of date with https://github.com/bazel-contrib/rules_python/blob/main/BZLMOD_SUPPORT.md which says the feature is GA now

[gemini-code-assist]

Summary of Changes

Hello @alexeagle, 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 updates the project's README.md to remove obsolete information concerning Bzlmod support. The previous documentation incorrectly indicated that Bzlmod was in a beta phase and lacked full feature parity. This change ensures that the main documentation accurately reflects the current stable and fully functional status of Bzlmod, directing users to the dedicated BZLMOD_SUPPORT.md for comprehensive details.

Highlights

• Documentation Update: Removed outdated guidance regarding Bzlmod support from the README.md file.
• Bzlmod Status: The documentation no longer states that Bzlmod support is in 'Beta' or lacks 'Full Feature Parity', reflecting its current General Availability (GA) status.

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[gemini-code-assist]

Code Review

This pull request removes outdated information regarding Bzlmod support from the README.md file. The change correctly deletes lines indicating a 'Beta' status and incomplete feature parity, which are no longer accurate according to the BZLMOD_SUPPORT.md document. By removing this duplicated summary and pointing to the canonical BZLMOD_SUPPORT.md file, the change improves documentation accuracy and maintainability by establishing a single source of truth. The modification is a positive and straightforward documentation cleanup.