fix replit codeblock syntax (#467)

* remove use/user-guides

* address manage assets capitalization

* update homepage link to User Guides

* Update transak.md

* add main section overviews, and subsection cards

* fix discord and other broken links

* update Flatten function

was a plugin -> now built-in to context menu

* normalize folder structure and fix missing images

* small fixes while we are here

* Update docs-integration-request.md

* fix replit codeblock

---------

Co-authored-by: Gregory Luneau <[email protected]>

docs/build/environment/light-client.md

@@ -100,7 +100,7 @@ Congratulations! You have successfully connected to the Astar Network using a li
 ## Run it in Replit
 
 ```mdx-code-block
-`import Iframe from 'react-iframe';`
+import Iframe from 'react-iframe';
 
 <Iframe
   url="https://replit.com/@gluneau/Light-Client-Demo-for-Astar-and-Shiden?embed=true"