try to fix scroll bug in docs svg viewer

.gitmodules

 [submodule "docs/svg-pan-zoom"]
 	path = docs/svg-pan-zoom
-	url = https://github.com/bumbu/svg-pan-zoom
+	url = https://github.com/WebSVG/svg-pan-zoom
 [submodule "docs/modelview"]
 	path = docs/modelview
 	url = https://github.com/jschobben/modelview

docs/generate_docs.sh

     echo "<embed type=\"image/svg+xml\" src=\"$file\" id=\"pz_$name\" style=\"width:100%;\"/>" >> src/inc_dispensy_sch.md
     echo "<script>" >> src/inc_dispensy_sch.md
     echo "document.getElementById('pz_$name').addEventListener('load', function(){" >> src/inc_dispensy_sch.md
-    echo "svgPanZoom(document.getElementById('pz_$name'), {controlIconsEnabled: true});" >> src/inc_dispensy_sch.md
+    echo "svgPanZoom(document.getElementById('pz_$name'), {controlIconsEnabled: true, minZoom: 1.0});" >> src/inc_dispensy_sch.md
     echo "})" >> src/inc_dispensy_sch.md
     echo "</script>" >> src/inc_dispensy_sch.md
     echo "</div>" >> src/inc_dispensy_sch.md

docs/src/main_board_pcb.md

     <embed type="image/svg+xml" src="./plot/dispensy_pcb.svg" id="pz_dispensy" style="width: 100%;"/>
     <script>
         document.getElementById('pz_dispensy').addEventListener('load', function(){
-            svgPanZoom(document.getElementById('pz_dispensy'), {controlIconsEnabled: true});
+            svgPanZoom(document.getElementById('pz_dispensy'), {controlIconsEnabled: true, minZoom: 1.0});
         })
     </script>
 </div>

docs/svg-pan-zoom

-Subproject commit 632c04b408854926087266022aff7557a363e1ba
+Subproject commit d9b9a55ef386c6fb04a82881ee233642d61e99cf