Playground updates (#58)

* Fixed typo

* Updated image organization

.github/workflows/build-push-template.yml

@@ -17,13 +17,13 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
         dockerfile: .devcontainer/Dockerfile
-        repository: jeluard/substrate-playground-template-node-template
+        repository: paritytech/substrate-playground-template-node-template
         tags: latest
         add_git_labels: true
         tag_with_ref: true
         tag_with_sha: true
 
-    - run: echo ::set-output name=image::jeluard/substrate-playground-template-node-template:sha-${GITHUB_SHA::7}
+    - run: echo ::set-output name=image::paritytech/substrate-playground-template-node-template:sha-${GITHUB_SHA::7}
       id: env
 
     - name: Update devcontainer.json

README.md

-[![Try on playground](https://img.shields.io/badge/Playground-node-templates-brightgreen?logo=Parity%20Substrate)](https://playground-staging.substrate.dev/?deploy=node-templates)
+[![Try on playground](https://img.shields.io/badge/Playground-node_template-brightgreen?logo=Parity%20Substrate)](https://playground-staging.substrate.dev/?deploy=node-template)
 
 # Substrate Node Template