README: update readme for new way of running ruby

Author: lordfolken

README.md

@@ -2,7 +2,7 @@
 
 1. Run Ruby Docker image
    ```
-   docker run -v ./:/data -it ruby:3.3.5  /bin/bash
+   docker run --network host -v ./:/data -it ruby:3.3.5  /bin/bash
    cd /data
    ```
 
@@ -16,6 +16,10 @@
    bundle exec jekyll build
    ```
 
+4. Start webserver
+   ```
+   jekyll serve
+
 ## How to generate a new post
 
 1. Generate a stub for the new post