docs: update install guide with new features and git update guide

- Section 4.1: add equity chart overlay toggles description
- Section 4.6: new Settings page docs — Dark/Light/Custom theme,
  colour pickers, text size, inject_theme_css() usage
- Section 4.7: Batch Backtest renumbered
- Section 9: new — Keeping Up to Date (git pull, pip install,
  restart, handling conflicts, checking current version)
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2026-04-15 08:27:33 +10:00
parent a784d26875
commit c4e1f4dfed
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