Add git insteadof example

[multimeric]

Closes #270.

[Copilot]

Pull Request Overview

This PR adds documentation for configuring Git to use GitHub App tokens for authentication, addressing issue #270. The addition provides guidance for scenarios where tools use Git directly but cannot accept GitHub API tokens.

• Adds a new documentation section explaining Git's insteadof configuration option
• Provides a complete workflow example for Python projects with private Git dependencies
• Includes additional configuration examples for repository and organization-specific authentication

[Copilot]

The placeholder 'USERNAME' in the Git URL is not explained. Consider clarifying what value should be used here or if it's a literal placeholder that Git ignores for token-based authentication.

Suggested change

	- name: Configure git to use the app token
	- name: Configure git to use the app token
	# The USERNAME part of the URL can be any non-empty string (e.g., 'x-access-token'), as GitHub ignores it when a token is used.

[Copilot]

This example uses the same unexplained 'USERNAME' placeholder. For consistency and clarity, this should match the explanation provided for the main example above.

Suggested change

	git config --global url."https://USERNAME:${GITHUB_TOKEN}@github.com/MyOrg/MyRepo".insteadOf "https://github.com/MyOrg/MyRepo"
	git config --global url."https://x-access-token:${GITHUB_TOKEN}@github.com/MyOrg/MyRepo".insteadOf "https://github.com/MyOrg/MyRepo"

[github-actions]

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