docs: use SSH remote for the Space

README.md

@@ -57,11 +57,10 @@ The app is published as the private Hugging Face Space
 `blambert/movement-tracker`. To install it, log in to Hugging Face from the
 robot's dashboard and add the app from there.
 
-The Space is a git remote. Set it up once (the credential step lets git
-authenticate with your Hugging Face token):
+The Space is a git remote. Set it up once (this requires an SSH key added to
+your Hugging Face account):
 
-    hf auth login --add-to-git-credential
-    git remote add space https://huggingface.co/spaces/blambert/movement-tracker
+    git remote add space git@hf.co:spaces/blambert/movement-tracker
 
 Then publish `main` to the Space: