docs: clarify automatic checks in built-in editor

[frobel0520]

Summary

Closes #78.

Clarify that the automatic edit-check-advance loop is provided by the built-in editor.

Document that external editors require saving the exercise and running pythonlings run manually. Update the how-it-works, quick-start, and homepage documentation to keep the workflow description consistent.

Tests

• mkdocs build --strict — passed
• python -m pythonlings --root tests/fixtures/passing_curriculum verify — passed (passing1, passing2)
• python -m pytest -q — 208 passed, 7 failed in this Windows environment:
  • 6 failures cannot create symlinks (WinError 1314)
  • 1 failure resolves an older installed pythonlings package without pythonlings.main
• git diff --check — passed

The strict documentation build also reports only existing warnings: the future MkDocs 2.0 compatibility warning and docs-site/AGENTS.md being outside the navigation.

Screenshots

Not applicable; documentation wording only.

Checklist

• Updated docs when behavior changed
• Added or updated tests — documentation-only change
• Verified python -m pytest -q — run; environment-only failures are documented above

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