enable yandex metrika (#140)

pages/_document.tsx

@@ -41,13 +41,13 @@ export default function Document() {
                 <script async src="https://tally.so/widgets/embed.js" />
 
                 {/* eslint-disable-next-line react/no-danger */}
-                {/* {process.env.YANDEX_METRIKA && (
+                {process.env.YANDEX_METRIKA && (
                     <div
                         dangerouslySetInnerHTML={{
                             __html: `<script>(function(m,e,t,r,i,k,a){m[i]=m[i]||function(){(m[i].a=m[i].a||[]).push(arguments)};m[i].l=1*new Date();k=e.createElement(t),a=e.getElementsByTagName(t)[0],k.async=1,k.src=r,a.parentNode.insertBefore(k,a)}) (window, document, "script", "https://mc.yandex.ru/metrika/tag.js", "ym");ym(${process.env.YANDEX_METRIKA}, "init", { clickmap:true, trackLinks:true, accurateTrackBounce:true });</script><noscript><div><img src="https://mc.yandex.ru/watch/${process.env.YANDEX_METRIKA}" style="position:absolute; left:-9999px;" alt="" /></div></noscript>`,
                         }}
                     />
-                )} */}
+                )}
             </body>
         </Html>
     );