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/acf-frontend-form.md

@@ -4,6 +4,7 @@ Found in the Elementor panel under **Dotjuice → ACF Frontend form**. Requires
 
 ![The ACF Frontend Form widget controls in the Elementor panel](../assets/img/acf-frontend-form-controls.png)
 *Screenshot: the widget selected in the editor with the Form Settings section open, showing the Form Mode, New Post Type, and New Post Status controls.*
+
 ## How it works
 
 This widget renders an editable form using ACF's own native form rendering (so tabs, repeaters, and every field type look and behave exactly as they do in the WordPress dashboard). It can work in one of two modes: