fix: JWT kid/jku lessons (#1949)

* refactor: rewrite hints

Use active voice and fix grammar issues.

* fix: use Thymeleaf `th:action`

* fix: JWT kid/jku lessons

Split the JavaScript into two files they pointed to the same URL

The JWTs are now valid, they parse successfully.

The paths now include `/kid` and `/jku` to make sure the hints match accordingly in the UI. Otherwise `/delete` would pick up both hints from both assignments as the paths overlap.

Closes: #1715

* fix: update to latest pre-commit version

* fix: increase timeouts for server to start during integration tests

src/main/resources/lessons/deserialization/html/InsecureDeserialization.html

@@ -25,7 +25,7 @@
             <div class="assignment-success"><i class="fa fa-2 fa-check hidden" aria-hidden="true"></i></div>
             <form class="attack-form" accept-charset="UNKNOWN" name="task"
                   method="POST"
-                  action="InsecureDeserialization/task">
+                  th:action="@{/InsecureDeserialization/task}">
 
                 <input type="textarea" rows="4" cols="40" value="" name="token" placeholder="token"/>
                 <input type="submit" value="Submit" />