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-cart.md

@@ -4,12 +4,14 @@ Found in the Elementor panel under **Dotjuice → Woo Cart**. Requires WooCommer
 
 ![The Woo Cart widget layout settings in the Elementor panel](../assets/img/woo-cart-controls.png)
 *Screenshot: the widget selected in the editor with the Layout section open, showing Desktop Layout, Totals Column Width, and the Show Coupon toggle.*
+
 ## How it works
 
 Place this widget on your Cart page template. It renders your shopper's current cart — items, coupon box, and totals — built independently of WooCommerce's default cart template, so it's fully restyled from the ground up.
 
 ![The Woo Cart widget on the front end](../assets/img/woo-cart-frontend.png)
 *Screenshot: a live cart page showing the two-column layout with cart items on the left, quantity steppers, and the totals panel on the right.*
+
 ## Layout settings
 
 | Setting | Default | What it does |