Update routing.md

articles/hubs/routing.md

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+# Routing 
+
+## What 
+Stoplight’s Hubs features an easy to use routing system to make sure your docs have identifiable and friendly URL’s. The routing system allows customization of the following objects: 
+
+- Your Hub 
+- Pages within a Hub (link) 
+- Subpages within a Hub (link) 
+- Headers + Footers (link)
+- Links 
+
+<callout>Tips for Friendly URL’s 
+
+Friendly URLs are links that are easily readable, rememberable, and relevant to the content.
+Take a look at the URL for this page. Instead of something like https://help.stoplight.io/docs/fnIenof/123, it is https://help.stoplight.io/docs/hosted-documentation/create-friendly-urls, which is much nicer. <callout>
+
+## How 
+
+### Pages & Subpages 
+
+1. Select the Hub you wish to modify 
+2. Add a new page or subpage (link) 
+   a. Select a page title to auto-fill the Page Route or 
+   b. Input a custom page route 
+3. Select an existing page or subpage 
+4. Select the gear icon at the top of the Hub in the center of the page or subpage you wish to modify  
+   a. Input a new URL under Page Route  
+
+### Headers & Footers 
+
+1. Select the Hub you wish to modify 
+2. Add a new header or footer (link) or
+3. Hover over an existing header or footer and click the gear icon 
+    a. Input a Path to Page or image URL