Many small adjustments

- Adjust header width for scrollbar presence
- Added new header assets for grass and dirt
- Adjusted styles for hosted and tracker
- Expand header to implement templating system
- Much more I have forgotten

WebHostLib/templates/header/grassHeader.html

@@ -0,0 +1,5 @@
+{% block head %}
+    <link rel="stylesheet" type="text/css" href="{{ static_autoversion("styles/header/grassHeader.css") }}" />
+{% endblock %}
+
+{% include 'header/baseHeader.html' %}