[bisq-network/bisq-website] Add Lazy Loading to images and iframes (#331)

[Steve Jain]

m52go requested changes on this pull request.

To be honest, I don't see a difference in the way images are loaded, and browser support isn't great, but I don't see a downside either. 

Please double-check that spacing is good throughout...I spotted 1 error.

> @@ -6,9 +6,9 @@
 
         <div class="col-12 col-lg-4 mt-md-0 mt-3 pl-md-5 pl-sm-3 small px-sm-4 px-4">
           <h5 class="text-uppercase small grey">Bisq mobile notification App</h5>
-          <a target="_blank" rel="noopener" class="app-link" href="https://play.google.com/store/apps/details?id=com.joachimneumann.bisq"><img class="badge-img" alt="Get it on Google Play" src="/images/badge_google_play.svg"/></a>
+          <a target="_blank" rel="noopener" class="app-link" href="https://play.google.com/store/apps/details?id=com.joachimneumann.bisq"><img class="badge-img" alt="Get it on Google Play" src="/images/badge_google_play.svg"loading="lazy"/></a>

```suggestion
          <a target="_blank" rel="noopener" class="app-link" href="https://play.google.com/store/apps/details?id=com.joachimneumann.bisq"><img class="badge-img" alt="Get it on Google Play" src="/images/badge_google_play.svg "loading="lazy"/></a>
```

Missing space.

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