Improve & refactor interactive tutorial code

Interactive tutorials: more consistent style

Interactive tutorials: Use new generics for send-xrp, use-tickets

Interactive tutorials: clean up now-unused code

Interactive tutorials: progress & debugging of errors

Interactive: Require Destination Tags; and related

- Validate addresses in Transaction Sender and warn on Mainnet X-address
- Option to load destination address from query param in Tx Sender
- Some more/updated helpers in interactive tutorial JS

Interactive tutorials: fix JA version

Interactive tutorials: readme, include code filter (incomplete)

Interactive tutorials: improvements for consistency

Interactive Tutorials: finish readme

Interactive tutorials: fix syntax errors

content/tutorials/get-started/monitor-incoming-payments-with-websocket.ja.md

@@ -79,7 +79,6 @@ const socket = new WebSocket('ws://localhost:6006')
 <button id="connect-button" class="btn btn-primary">Connect</button>
 <strong>Connection status:</strong>
 <span id="connection-status">Not connected</span>
-<div id='loader-{{n.current}}' style="display: none;"><img class='throbber' src="assets/img/xrp-loader-96.png"></div>
 <h5>Console:</h5>
 <div class="ws-console" id="monitor-console-connect"><span class="placeholder">(Log is empty)</span></div>
 {{ end_step() }}

content/tutorials/get-started/monitor-incoming-payments-with-websocket.md

@@ -79,7 +79,6 @@ Example:
 <button id="connect-button" class="btn btn-primary">Connect</button>
 <strong>Connection status:</strong>
 <span id="connection-status">Not connected</span>
-<div id='loader-{{n.current}}' style="display: none;"><img class='throbber' src="assets/img/xrp-loader-96.png"></div>
 <h5>Console:</h5>
 <div class="ws-console" id="monitor-console-connect"><span class="placeholder">(Log is empty)</span></div>
 {{ end_step() }}