Add version query param to install page

static/index.md

@@ -2,10 +2,34 @@
 
 Add some information about your project here.
 
-# Installation
+# Install Latest Version
 
 You can use the button below to install the pre-built firmware directly to your device via USB from the browser.
 
-<esp-web-install-button manifest="firmware/firmware.manifest.json"></esp-web-install-button>
+<esp-web-install-button
+      manifest="https://firmware.esphome.io/project-template/project-template/manifest.json">
+    </esp-web-install-button>
 
 <script type="module" src="https://unpkg.com/esp-web-tools@10/dist/web/install-button.js?module"></script>
+
+<details>
+  <summary>Install Specific Version</summary>
+  Version: <input />
+</details>
+
+<script>
+  function setVersion(version) {
+    document.querySelector('h1#install_latest_version').innerHTML = `Install {{ site.title }} ${version}`;
+    document.querySelector('esp-web-install-button').manifest = `https://firmware.esphome.io/project-template/project-template/${version}/manifest.json`;
+  }
+
+  document.querySelector('input').addEventListener('change', ev => {
+    const version = ev.target.value;
+    setVersion(version);
+  });
+  var urlParams = new URLSearchParams(window.location.search);
+  if (urlParams.has('version')) {
+    const version = urlParams.get('version');
+    setVersion(version);
+  }
+</script>