remove pixi run postinstall from readme (#151)

Author: pavelzw

template/README.md.jinja

@@ -19,6 +19,5 @@ git clone {{ github_url }}
 cd {{ project_slug }}
 
 pixi run pre-commit-install
-pixi run postinstall
 pixi run test
 ```

template/{% if use_devcontainer %}.devcontainer{% endif %}/devcontainer.json.jinja

@@ -14,6 +14,6 @@
       "ghcr.io/devcontainers/features/docker-in-docker:2": {}
     },
     "mounts": ["source=${localWorkspaceFolderBasename}-pixi,target=${containerWorkspaceFolder}/.pixi,type=volume"],
-    "postCreateCommand": "sudo chown vscode .pixi && pixi run postinstall && git config --global --add safe.directory ${containerWorkspaceFolder}",
+    "postCreateCommand": "sudo chown vscode .pixi && pixi install && git config --global --add safe.directory ${containerWorkspaceFolder}",
     "postStartCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}"
 }