docs: remove instructions for orb (#629)

Author: johnstonmatt

DEVELOPERS.md

@@ -40,18 +40,6 @@ docker build -t supabase/edge-runtime .
 docker run -it --rm -p 9000:9000 -v ./examples/:/examples supabase/edge-runtime start --main-service /examples/main
 ```
 
-Another option would be to install [Orb](https://docs.orbstack.dev/install) and
-use an [Orbstack Machine](https://docs.orbstack.dev/machines/) to run a Linux
-Machine.
-
-First create a machine:
-
-```
-orb create ubuntu new-ubuntu
-```
-
-and run `orb` in the base directory to enter the virtual machine.
-
 ## How to run tests
 
 ```sh