Add proxy setup documentation for configuring CCR as an upstream in popular 3rd-party repository solutions

[steviecoaster]

Checklist

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Is Your Feature Request Related To A Problem? Please describe.

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Describe The Solution. Why is it needed?

We need documentation that helps a user configure a proxy repository to use the Chocolatey Community Repository as its upstream among the following 3rd-party repository solutions:

• Inedo ProGet
• JFrog Artifactory
• Sonatype Nexus

The documentation should provide clear, step-by-step guidance that helps the user complete the server configuration.

In addition to the server configuration, documentation should be added to configure Chocolatey CLI to use the newly created proxy repository as a source.

User Story

As a user, I want to use the Chocolatey Community Repository in a responsible manner, as its large collection of packages available provides great value to my organization.

The documentation helps me set up my own internal repository that provides access to the Chocolatey Community Repository as an upstream, while helping me reduce rate limits, blocks, and downtime.

Additional Context

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Acceptance Criteria

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Related Issues

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