Update subpages.md

articles/hubs/subpages.md

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 ## What
 Subpages are the second tier macro building blocks of Hubs. They function as a canvas for blocks. They are commonly used to house content based on a specific topic.  Subpages can have more subpages nested underneath them, which gives you lots of flexibility to organize your Hub as you see fit. If a subpage has subpages nested inside of it, it will be displayed as a collapsible group in the left sidebar.
 
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 >Subpages populate the navigational sidebar of a page.
 
 ### Hubs Architecture Top Down
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     3. Give the Subpage a **Sidebar Token** (optional) 
     4. **Power the Subpage** with an External Data Source (optional) 
 
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 >Just like pages, subpages can have blocks. Any blocks added to a subpage will be displayed when a reader navigates to that subpage in your Hub
 
 ---
 **Related Articles**
-- [Pages](./pages.md)
-- [Headers & Footers](./managing-headers-footers.md)
-- [Routing](./routing.md)
-- [Publishing](./publishing.md)
+- [Routing](/documentation/getting-started/routing)
+- [Headers & Footers](/documentation/getting-started/header-footer)
+- [Pages](/documentation/getting-started/pages)
+- [Publishing](/documentation/publishing)