Use new version of aoe_technology_radar and align readme

Readme.md

@@ -2,18 +2,18 @@
 
 This is the location of AOE techradar content - published under: https://www.aoe.com/techradar/index.html
 
-
-
 ## Development
+### Requirements
+Install the [yarn package manager](https://yarnpkg.com/getting-started/install).
+
 ### Host the application under a sub path
-To host the application under a sub path, set the environment variable `PUBLIC_URL`, e.g. "/techradar". The default is `/techradar`.
+To host the application under a sub path, set the environment variable `PUBLIC_URL`, e.g. "/techradar". The default is `/build`.
 
 > For local development I recommend using `/build` and use this for the following steps. 
 
 ### Build the radar
 ```
-yarn
-export PUBLIC_URL="/build" && yarn start
+yarn start
 ```
 
 Then open here: http://localhost:8080/build