Remove docker-in-docker feature (incompatible with forky base)

The base image reports Debian 'forky' which the docker-in-docker
feature does not support. Codespaces provides Docker access already;
local devcontainer users who need Docker can mount the host socket.

Made-with: Cursor

Author: stewartshea

.devcontainer/devcontainer.json

@@ -23,9 +23,6 @@
     "postStartCommand": "python -m http.server --bind 0.0.0.0 --directory /robot_logs 3000 &",
 
     "features": {
-        "ghcr.io/devcontainers/features/docker-in-docker:2": {
-            "moby": false
-        },
         "ghcr.io/devcontainers/features/sshd:1": {
             "version": "latest"
         }