nojs: add an explanation page

html/index.html

@@ -242,6 +242,11 @@
                 <input class="form-button" type="submit" value="Send" />
             </form>
 
+            <p class="text-description text-warning">
+                Never trust random scripts from the internet! Make sure you understand the perl script above.
+                If you don't, click&nbsp<a class="link" href="/checkpoint/explainNoJs" target="_blank" style="text-decoration: underline;">here</a>&nbspfor an explanation.
+            </p>
+
             <style>
                 .form-label {
                     color: #fff;
@@ -281,6 +286,10 @@
                     position: absolute;
                 }
 
+                .text-warning {
+                    color:#c03940;
+                }
+
                 .require-js {
                     display: none;
                 }