docs: collect feedback form

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

website/plugins/docusaurus-plugin-hotjar/index.js

@@ -0,0 +1,46 @@
+const path = require("path");
+
+module.exports = function (context) {
+  const { siteConfig } = context;
+  const { themeConfig } = siteConfig;
+  const { hotjar } = themeConfig || {};
+
+  if (!hotjar) {
+    throw new Error(
+      `Create a 'hotjar' object containing a 'siteId' property in 'themeConfig'.`
+    );
+  }
+
+  const { siteId } = hotjar;
+
+  if (!siteId) {
+    throw new Error(
+      "Error in `themeConfig`. `hotjar` object found but `siteId` prop is missing."
+    );
+  }
+
+  return {
+    name: "docusaurus-plugin-hotjar",
+
+    injectHtmlTags() {
+      return {
+        headTags: [
+          {
+            tagName: "script",
+            innerHTML: `
+            <!-- Hotjar Tracking Code -->
+            (function(h,o,t,j,a,r){
+                h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
+                h._hjSettings={hjid:${siteId},hjsv:6};
+                a=o.getElementsByTagName('head')[0];
+                r=o.createElement('script');r.async=1;
+                r.src=t+h._hjSettings.hjid+j+h._hjSettings.hjsv;
+                a.appendChild(r);
+            })(window,document,'https://static.hotjar.com/c/hotjar-','.js?sv=');
+            `,
+          },
+        ],
+      };
+    },
+  };
+};