limit Onionoo default listening to localhost
This means shipping a jetty.xml with the following change:
<New class="org.eclipse.jetty.server.ServerConnector">
<Arg>
<Ref id="server"/>
</Arg>
<Set name="port">8080</Set>
+ <Set name="host">127.0.0.1</Set>
</New>
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information