message: Fix external web link on desktop
diff: <div class="uk-card-header uk-form-horizontal">
  <p><strong>Multisig is an alternative way of storing and transacting Nano by having multiple private keys bound to a single address. The keys can be owned my multiple users.</strong>
  <br>
  - A full user guide is found <a href="https://docs.nault.cc/2021/04/14/multisig.html">here</a>.
  + A full user guide is found <a href="https://docs.nault.cc/2021/04/20/multisig.html" target="_blank">here</a>.
  </p>
  <h4>1 - Create a Multisig Address</h4>
  