fix(guidelines): add for urls

pages/guidelines.mdx

@@ -80,6 +80,20 @@ When creating an entirely new documentation page from scratch, we generally expe
 
 All Scaleway documentation pages should be `.mdx` files (MDX is an extension to Markdown that lets you include JSX). Any images included within the page must be `.webp` files.
 
+### Page URL
+
+All Scaleway product documentation pages have URLs that should conform to the following format:
+
+`https://www.scaleway.com/en/docs/<product-name>/<page-type>/<page-slug>/`
+
+| URL element | Description | Guidance |
+|-------------|-------------|----------|
+| Product name | Scaleway documentation and developers sites use the **full product name** in their URLs. | ✅ managed-databases-for-redis, container-registry <br/><br/>❌ redis, registry |
+| Page type | All product documentation pages should conform to one of the [page types listed above](#page-type) | E.g. `how-to`, `api-cli`, `concepts`. |
+| Page slug | A short, descriptive, slug, usually based on the title of the page. To keep slugs short, you can omit the product name<br/>(already in the URL at a higher level) and stopwords. Note that certain page types (concepts, quickstart etc.) do not have further page slugs and terminate at type.| ✅ manage-flexible-ips, create-pipeline <br/><br/>❌ manage-your-instance-flexible-ips, create-an-edge-services-pipeline |
+
+Note that for [tutorials](/tutorials/), the URL format is: `https://www.scaleway.com/en/docs/tutorials/<page-slug>/`, and it is pertinent to include the relevant product name in the page slug, as it does not appear elsewhere in the URL.
+
 ### Page structure
 
 Scaleway Documentation pages should conform to the following structure: