Document the new Pro PDF Viewer widget

Adds the docs-site page and the website marketing copy for the PDF
Viewer widget shipped in Pro 20260908.1.

- docs: full widget guide (source, zoom, toolbar, styling, gotchas),
  listed in the Pro getting-started widget index, with the usual two
  placeholder screenshots to be replaced with real captures.
- getting-started: PDF Viewer noted as having no WooCommerce or ACF
  dependency.
- marketing: widget page plus a "What's included" entry and an updated
  strapline on the Pro overview.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/dotjuice-elementor-tools-pro/getting-started.md

@@ -6,7 +6,7 @@ Dotjuice Elementor Tools Pro requires:
 
 - **The free [Dotjuice Elementor Tools](../dotjuice-elementor-tools/getting-started.md) plugin**, installed and active — Pro is an add-on, not a standalone plugin.
 - **Elementor** (required by the free plugin).
-- **WooCommerce**, for every WooCommerce-related widget (all of them except ACF Frontend Form).
+- **WooCommerce**, for every WooCommerce-related widget (all of them except ACF Frontend Form and PDF Viewer).
 - **Advanced Custom Fields (ACF)**, only for the ACF Frontend Form widget.
 - **Elementor Pro**, only for Woo Quick View's popup and the [EspoCRM Lead Capture](espocrm-integration.md) integration (Forms is an Elementor Pro feature).
 
@@ -24,6 +24,7 @@ If a specific widget is missing:
 
 - **All WooCommerce widgets** need WooCommerce active.
 - **ACF Frontend Form** needs Advanced Custom Fields active.
+- **PDF Viewer** has no plugin dependencies at all beyond your Pro licence.
 - **Woo Quick View** needs **Elementor Pro** for its popup functionality — without Elementor Pro, its button falls back to a plain link to the product page instead of opening a popup.
 
 ## Widget guides
@@ -33,6 +34,7 @@ If a specific widget is missing:
 - [Woo Quick View](widgets/woo-quick-view.md)
 - [Woo Custom Product Tabs](widgets/woo-custom-product-tabs.md)
 - [ACF Frontend Form](widgets/acf-frontend-form.md)
+- [PDF Viewer](widgets/pdf-viewer.md)
 
 ## Integrations