message: Update advanced mode install command to accept user input
diff: <iron-icon src="images/terminal.svg" id="terminalIcon"></iron-icon>
  <div class='stepContent'>
  <div class='instructions'>First, log into your server, and run the following command:</div>
  - <div id='command' class='code'>wget -qO- https://raw.githubusercontent.com/Jigsaw-Code/outline-server/master/src/server_manager/install_scripts/install_server.sh | bash</div>
  + <div id='command' class='code'>bash -c "$(wget -qO- https://raw.githubusercontent.com/Jigsaw-Code/outline-server/master/src/server_manager/install_scripts/install_server.sh)"</div>
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