fix(doc): new section for running from source

Author: Akos Kitta

docs/development.md

@@ -57,6 +57,8 @@ Please refer to the [Theia IDE prerequisites](https://github.com/eclipse-theia/t
 
 Once you have all the tools installed, you can build the editor following these steps
 
+### Run From Source
+
 If you want to develop the application, do the following:
 
 1. Install the dependencies