Move contrast checking into Python

Change banner size dependent on group content
Tidy up inline JS for some files
Correct spelling

gallery/themes/default/components/image-view/info-tab.sass

@@ -12,7 +12,6 @@
 
 .info-tab
     width: 100%
-    max-height: 100%
 
     display: flex
     flex-direction: column
@@ -114,7 +113,7 @@
         margin: 0
         padding: 0
 
-        max-width: 100%
+        width: 100%
 
         overflow-x: hidden
         border-collapse: collapse