okay this now works with bootstrap 5, I dont love the sz buttons / mixed black and white hover text needs love - probably own class with own styles, but I dont want to hard-code info color, need to work out how to do style / css using the right bs variable for info color

templates/refimgs.html

@@ -4,7 +4,7 @@
 <h3>Show All Reference Images</h3>
 <table id="refimg_table" class="table table-striped table-sm" data-toolbar="#toolbar" data-search="true">
 	<thead>
-		<tr class="thead-light"><th>Filename</th></tr>
+		<tr class="table-primary"><th>Filename</th></tr>
 	</thead>
 	<tbody>
 	{% for refimg in refimgs %}