Don't generate .png typegraph files

Author: coke

htmlify.p6

@@ -671,12 +671,6 @@ sub write-type-graph-images(:$force, :$parallel) {
             @type-graph-images = ();
         }
 
-        @type-graph-images.push: $viz.to-file("html/images/type-graph-{$type}.png", format => 'png', size => '8,3');
-        if @type-graph-images %% $parallel {
-            await(@type-graph-images);
-            @type-graph-images = ();
-        }
-
         print '.';
 
         LAST await(@type-graph-images);
@@ -700,12 +694,6 @@ sub write-type-graph-images(:$force, :$parallel) {
             @specialized-visualizations = ();
         }
 
-        @specialized-visualizations.push: $viz.to-file("html/images/type-graph-{$group}.png", format => 'png', size => '8,3');
-        if @specialized-visualizations %% $parallel {
-            await(@specialized-visualizations);
-            @specialized-visualizations = ();
-        }
-
         LAST await(@specialized-visualizations);
     }
 }

template/type-graph.html

@@ -4,7 +4,6 @@ <h1>Type graph</h1>
   INLINESVG
   <p class="fallback">
     Stand-alone image:
-    <a rel="alternate" href="/images/type-graph-ESCAPEDPODNAME.svg" type="image/svg+xml">vector</a>,
-    <a rel="alternate" href="/images/type-graph-ESCAPEDPODNAME.png" type="image/png">raster</a>
+    <a rel="alternate" href="/images/type-graph-ESCAPEDPODNAME.svg" type="image/svg+xml">vector</a>
   </p>
 </figure>