Update catalog.md iframe height to minimise scrolling in Catalog Browser.

Author: oj-tooth

docs/docs/catalog.md

@@ -9,7 +9,7 @@
 <iframe
   src="https://radiantearth.github.io/stac-browser/#/external/noc-msm-o.s3-ext.jc.rl.ac.uk/oceandatastore/noc-model-stac/catalog.json"
   width="100%"
-  height="800px"
+  height="1800px"
   style="border: none; border-radius: 4px;"
   loading="lazy"
   title="STAC Browser">