[EN-4135] feat(chat): install crisp widget

src/pages/_document.js

@@ -13,6 +13,13 @@ export default class MyDocument extends Document {
             async
             src={`https://www.googletagmanager.com/gtag/js?id=${process.env.GA_TRACKING_ID}`}
           />
+          <script
+            dangerouslySetInnerHTML={{
+              __html: `
+                window.$crisp=[];window.CRISP_WEBSITE_ID="26a368b7-ee62-40c8-b796-e64b26fac06d";(function(){d=document;s=d.createElement("script");s.src="https://client.crisp.chat/l.js";s.async=1;d.getElementsByTagName("head")[0].appendChild(s);})();
+              `,
+            }}
+          />
           <script
             dangerouslySetInnerHTML={{
               __html: `