Fix Docker repository name in build script

- Update all Docker image references to use skoszewski/jmespath-playground
- Fix build.sh to create properly namespaced Docker images for Docker Hub
- Update Docker run command examples with correct repository name

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jmespath-playground",
-  "version": "1.1.3",
+  "version": "1.1.4",
   "description": "A React-based web application for testing JMESPath expressions against JSON data",
   "main": "index.js",
   "scripts": {