add /user/site-settings.html template.

The code at the moment is very rough. I've only got the 'Enable
Sign-Up' section set-up (front-end). The back-end part is not done yet .

templates/user/site-settings.html

@@ -0,0 +1,25 @@
+{% extends "layouts/default.html" %}
+{% block title %}Nicola Ellis & Ritherdon Archive{% endblock %}
+{% block content %}
+<h1>Site Settings</h1>
+<a href="/dashboard">Dashboard</a>
+
+<form action="/settings/sign-up" method="post">
+    <input type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
+    <input type="checkbox" name="ENABLE-SIGN-UP" values="{{settings.enable-sign-up}}">
+    <label>Enable Sign-Up</label>
+    <input type="submit" value="Save Changes">
+</form>
+
+<h2>Not Implemented</h2>
+<form action="/settings/home-page" method="post">
+    <input type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
+    <label>Set Home Page</label>
+    <span>Currently set to: {{settings.home-page}}</span>
+    <select name="SET-HOME-PAGE">
+	<option>Default</option>
+    </select>
+    <input type="submit" value="Set Home Page">
+</form>
+
+{% endblock %}