Added missing scarf to docs. (CycloneDX#860)

Added scarf to docs (already in production)

Author: jkowalleck

docgen/json/templates/cyclonedx/base.html

@@ -95,5 +95,6 @@ <h1>{{ title }}</h1>
 </footer>
 -->
 
+  <img referrerpolicy="no-referrer-when-downgrade" src="https://static.scarf.sh/a.png?x-pxid=ce3b481f-33a5-4c88-aaf1-00c8805f24d9" />
 </body>
 </html>

docgen/proto/templates/html.tmpl

@@ -569,5 +569,6 @@ https://github.com/pseudomuto/protoc-gen-doc/blob/master/resources/html.tmpl
     </table>
 
 </div>
+    <img referrerpolicy="no-referrer-when-downgrade" src="https://static.scarf.sh/a.png?x-pxid=ce3b481f-33a5-4c88-aaf1-00c8805f24d9" />
   </body>
 </html>

docgen/xml/xs3p.xsl

@@ -491,6 +491,7 @@
                });
                </xsl:text>
             </script>
+            <img referrerpolicy="no-referrer-when-downgrade" src="https://static.scarf.sh/a.png?x-pxid=ce3b481f-33a5-4c88-aaf1-00c8805f24d9" />
          </body>
       </html>
    </xsl:template>