docs: fix stale GitHub docs links

[JSap0914]

Summary

• update stale GitHub Docs URLs in projects/version-control.qmd
• correct the same-page GitHub Flow anchor casing to match the Quarto heading ID

Fixes #5.

Evidence

Issue #5 reports that the GitHub Flow link in the Git workflow section is dead. Direct checks showed the old GitHub Flow URL returns HTTP 404 and the current GitHub Docs URL returns HTTP 200.

While checking the same page, two other GitHub Docs URLs also returned HTTP 404; their current official targets return HTTP 200.

Duplicate checks

Before editing and again before PR creation, open PR searches for the GitHub Flow URL, the stale GitHub Docs paths, and this head branch returned no matches.

Verification

• git diff --check
• direct curl -I -L checks for each old/new external URL pair
• npm_config_script_shell=/bin/bash npx --yes markdown-link-check projects/version-control.qmd

The markdown link check now passes the updated external links. It still reports the Quarto custom same-page anchors #making-changes, #github-flow, and #git-basics as 404 because the checker does not resolve {#...} heading IDs; those IDs are defined in this file.

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