Flatten marketing paths ahead of wiring up the websites

Drop the redundant documentation/marketing/ nesting inherited from the
plugin repos, so files sit at marketing/<plugin>/<page>.md. These paths
become raw URLs pasted into Elementor pages and ACF fields, so they are
much cheaper to change now than once sites reference them.

Fixes the four cross-plugin links for their new depth, and corrects the
README, which still pointed at the abandoned per-repo documentation/
folders instead of this repo.

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

marketing/dotjuice-elementor-tools/product-attribute-colours.md

@@ -0,0 +1,17 @@
+# Product Attribute Colours
+
+A proper colour manager for your product attributes — the missing piece behind real colour swatches on your store.
+
+## The problem it solves
+
+WooCommerce doesn't have a built-in way to say "this Red attribute term is actually this exact shade of red" — so building colour swatches for variable products usually means custom development or a dedicated (often paid) swatches plugin.
+
+## How it helps
+
+Product Attribute Colours gives every term in any of your product attributes (Colour, Material, or any custom attribute) its own colour picker, with support for multiple terms sharing the same swatch colour — perfect for near-identical shades like "Ash", "Carbon Grey", and "Slate" that should all display the same swatch.
+
+## The result
+
+A central place to define your product colours once, ready to power colour swatches anywhere on your store that supports them.
+
+*Configuring colours here is free. Displaying them as clickable swatches on your product pages uses the [Woo Add to Cart Transform](widgets/woo-add-to-cart-transform.md) widget's swatch mode, which is a [Pro](../dotjuice-elementor-tools-pro/overview.md) feature.*