restructure repo, separate sample app from docker configs

05-example-web-application/client-react/src/App.css

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+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

05-example-web-application/client-react/src/App.jsx

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+import { useState } from 'react'
+import {
+  QueryClient,
+  QueryClientProvider,
+  useQuery,
+} from "@tanstack/react-query";
+import axios from "axios";
+
+import './App.css'
+
+const queryClient = new QueryClient();
+
+function Example(props) {
+  const { isLoading, error, data, isFetching } = useQuery({
+    queryKey: [props.api],
+    queryFn: () =>
+      axios
+        .get(`${props.api}`)
+        .then((res) => res.data),
+  });
+
+  if (isLoading) return `Loading ${props.api}... `;
+
+  if (error) return "An error has occurred: " + error.message;
+
+  return (
+    <div className="App">
+      <p>---</p>
+      <p>API: {data.api}</p>
+      <p>Time from DB: {data.now}</p>
+      <div>{isFetching ? "Updating..." : ""}</div>
+    </div>
+  )
+}
+
+export function App() {
+  return (
+    <QueryClientProvider client={queryClient}>
+      <h1>Hey Team! 👋</h1>
+      <Example api="/api/golang/"/>
+      <Example api="/api/node/"/>
+    </QueryClientProvider>
+  );
+}
+
+export default App

05-example-web-application/client-react/src/index.css

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+:root {
+  font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
+  font-size: 16px;
+  line-height: 24px;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-text-size-adjust: 100%;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}

05-example-web-application/client-react/src/main.jsx

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+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)