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/challenges/html/Challenge1.html

@@ -17,7 +17,7 @@
                 <div class="panel-body">
                     <form class="attack-form" accept-charset="UNKNOWN"
                           method="POST" name="form"
-                          action="challenge/1"
+                          th:action="@{/challenge/1}"
                           style="width: 200px;">
 
                         <div class="form-group">
@@ -37,7 +37,7 @@
             </div>
         </div>
 
-        <form class="attack-form" method="POST" name="form" action="challenge/flag/1">
+        <form class="attack-form" method="POST" name="form" th:action="@{/challenge/flag/1}">
             <div class="form-group">
                 <div class="input-group">
                     <div class="input-group-addon"><i class="fa fa-flag-checkered" aria-hidden="true"