docs(gateway): revise curl wrapper script details in README

[tomgrv]

Updated README to reflect changes in command and cookie file paths.

[gemini-code-assist]

Summary of Changes

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This pull request updates the documentation for the gateway component to reflect recent changes in the installation process and script naming conventions. It ensures that users have the correct commands and file paths for the curl wrapper functionality.

Highlights

• Command update: Updated the manual installation command to include the -s flag for the gateway feature.
• Documentation cleanup: Removed the outdated list of included Dev Container features from the README.
• Script renaming: Renamed the curl wrapper script from zscaler-curl to gateway-curl and updated the associated cookie file path.

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[gemini-code-assist]

Code Review

This pull request updates the src/gateway/README.md by modifying the manual installer command, removing the list of included dev container features, and renaming the zscaler-curl script and its cookie file to a more generic gateway-curl naming. Review feedback indicates that the documentation should specify the .sh extension for the script to ensure it functions correctly and should maintain the 'Zscaler' terminology as the implementation remains specific to that service.