Comment out PNG generation in tools/genexamples.sh

We don't reeeeaaaaally need PNG files for this, plus if we include PNGs
it will make the repository unwieldy and annoying.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

tools/genexamples.sh

@@ -18,8 +18,8 @@ while read infile; do
             pngfile="examples/$(basename -s .in "$infile")-$hash-$matrix.png"
             echo "Generating $svgfile"
             python3 -m colorhash "$infile" --output-type svg --out "$svgfile" --hash "$hash" --matrix "$matrix"
-            echo "Generating $pngfile"
-            convert "$svgfile" "$pngfile"
+            #echo "Generating $pngfile"
+            #convert "$svgfile" "$pngfile"
         done
     done
 done