Explain more in the Readme.md to make local development easier.

Readme.md

@@ -1,19 +1,29 @@
 # AOE Technology Radar
 
-## Generate json file of the markdown files
+## Development
+### 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".
+For local development I recommend using "/build" and use this for the following steps. 
+
+### Build the radar
+```
+yarn build
+python3 -m http.server 8080
+```
+
+Then open here: http://localhost:8080/build
+
+### Build the radar with static files
+```
+yarn build:static
+python3 -m http.server 8080
+```
+
+Then open here: http://localhost:8080/build
+
+### Regenerate the json file based on your changes on md files
 ```
 yarn generateJson
 ```
 
-## Build the radar
+You can do this while the server is running. You can find the newly created rd.json in "/build/rd.json". 
-```
-yarn build
-```
-
-## Serve
-```
-cd build
-python3 -m http.server 8080
-```
-
-Then open here: http://localhost:8080