react-java-mysql: use create-react-app for frontend

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-java-mysql/frontend/.gitignore

@@ -1,4 +1,23 @@
-node_modules
-.happypack
-build/*
-dist/*
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*