Added devcontainer.json

Author: spoenemann

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/typescript-node
+{
+	"name": "Node.js & TypeScript",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/typescript-node:1-22-bookworm",
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [8080],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "yarn install"
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.gitpod.yml

@@ -1,8 +1,5 @@
 ![Sprotty](./sprotty-logo-500px.png)
 
-[![Gitpod - Code Now](https://img.shields.io/badge/Gitpod-code%20now-blue.svg?longCache=true)](https://gitpod.io#https://github.com/eclipse-sprotty/sprotty)
-[![Join the chat at https://gitter.im/eclipse/sprotty](https://badges.gitter.im/eclipse/sprotty.svg)](https://gitter.im/eclipse/sprotty?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-
 This is the client part of _Sprotty_, a next-generation, open-source diagramming framework built with web technologies.
 
 <img src="https://raw.githubusercontent.com/wiki/eclipse/sprotty/images/screenshot0.png" width="23%" align="left">