andy-huddo landing page image descriptions (#58789)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: andy-huddo-hudson

assets/images/banner-images/selecting-banner-images.md

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+There are 6 different banner images to use on landing pages. 
+
+Journey landing pages
+- hero-1
+- hero-2
+
+ Bespoke landing pages
+- hero-3
+- hero-4
+
+Discovery landing pages
+- hero-5
+- hero-6