docs: Restructure Git & GitHub 101 into phases

[adiati98]

Linked Issue

Closes #1671

Description

This PR restructures the Git & GitHub 101 page into four phases. It does not add new content.

• Replaces the heading "Contributing to Open Source with Git and GitHub" with four phase headings. Each phase holds its existing sections:
  • "Setting Up": Forking a Repository, Authenticating with GitHub, Cloning a Repository, Adding an upstream Remote Repository
  • "Making a Change": Creating a New Branch, Adding and Committing Changes
  • "Sending Your Change": Pushing Changes, Making a Pull Request
  • "Keeping Your Fork Up to Date": Syncing Your Fork with upstream, Synchronizing Changes Locally, Resolving Merge Conflicts
• Moves the sync and merge conflict sections after the pull request.
• Marks "Advanced Git and GitHub Workflows" and "Getting the Most Out of Your GitHub Profile" as optional.
• Updates the sentences that depended on the old order, and links to "Keeping Your Fork Up to Date" from "Making a Pull Request".

Methodology

Code of Conduct

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[greptile-apps]

Confidence Score: 5/5

[Low impact] This PR appears safe to merge.

Summary

Reorganizes the Git and GitHub guide into four phases and marks the advanced workflows and profile sections as optional.

• Moves fork syncing and conflict resolution after the pull request steps.
• The latest change clarifies the final push instruction without changing its link.
• The previous unnumbered finding is fully addressed: readers are now told to push after fixing conflicts locally.

_{Reviews (3) · Last reviewed commit: "docs: fix formatting of push step" · Reviewed by Greptile}