Embed Plant UML diagram correctly into HTML

ParameterCatalogs.html

@@ -1264,7 +1264,7 @@ Instead of artificial example classes like <em>Foo</em> and <em>Bar</em> it show
 </div>
 <div class="imageblock thumb">
 <div class="content">
-<img src="http://localhost:57513/afx/cache/28c119036261e39473751e5cb111acc9.png" alt="28c119036261e39473751e5cb111acc9">
+<img src="ParameterCatalogs2Images/CatalogStructure.png" alt="CatalogStructure">
 </div>
 <div class="title">Figure 4. Principle Structure of a Parameter Catalog</div>
 </div>
@@ -2187,7 +2187,7 @@ Verify that Maven version 3.6.3 or above is now installed in <code>Window &#8594
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-04-20 12:48:52 +0200
+Last updated 2021-04-21 11:13:52 +0200
 </div>
 </div>
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/github.min.css">

ParameterCatalogs2Creation.adoc

@@ -237,7 +237,7 @@ See here the essential and typical structure of a parameter catalog in a class d
 Instead of artificial example classes like _Foo_ and _Bar_ it shows classes from an existing catalog, albeit in very condensed form.
 
 .Principle Structure of a Parameter Catalog
-[plantuml, role="thumb"]
+[plantuml, CatalogStructure, png, role="thumb"]
 ----
 together {
   class SolarPanel