Sync docs with recent plugin changes; formatting and placeholder cleanup

- Document the new Panel Text Color control on Woo Custom Product Tabs
  (dotjuice-elementor-tools-pro 20260817.1)
- Document Dark Mode Toggle now persisting site-wide (pages without the
  toggle) and applying before first paint (dotjuice-elementor-tools
  c33084e)
- Add blank line before headings following image captions across pro
  widget docs, so they render correctly
- Regenerate placeholder screenshots for pro widget and pagespeed docs
- Remove stray H1 from the free plugin marketing overview (post title
  already serves as H1, matching the other marketing files)
- Bump local dev port to 3080, drop unused site/docs/.gitkeep

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SZsdkGdZYtCS6hZaX92NQ6

docs/dotjuice-elementor-tools-pro/widgets/woo-quick-view.md

@@ -6,6 +6,7 @@ Requires WooCommerce. **Requires Elementor Pro** for the popup to actually open
 
 ![The Woo Quick View widget settings in the Elementor panel](../assets/img/woo-quick-view-controls.png)
 *Screenshot: the widget selected in the editor with the Quick View settings open, showing the Enable Quick View toggle and the popup selector.*
+
 ## How it works, end to end
 
 1. You build a popup (an Elementor Pro popup content type) containing the **Woo Quick View Popup** widget.