Webhost: fix doc and yaml filenames / install paths (#4193)

* WebHost: use new safe yaml template filename

this mirrors the change in ArchipelagoMW/#4106 in WebHost

* WebHost: install docs into safe filename and require docs to be named safe

* Test: update doc test for safe name

* WebHost: fix import order to not break ModuleUpdate

WebHostLib/templates/tutorial.html

@@ -11,7 +11,7 @@
 {% endblock %}
 
 {% block body %}
-    <div id="tutorial-wrapper" class="markdown" data-game="{{ game }}" data-file="{{ file }}" data-lang="{{ lang }}">
+    <div id="tutorial-wrapper" class="markdown" data-game="{{ game | get_file_safe_name }}" data-file="{{ file | get_file_safe_name }}" data-lang="{{ lang }}">
         <!-- Content generated by JavaScript -->
     </div>
 {%  endblock %}