Create base forms for registration and sign in

Created routes and forms for registration, sign in, and registration
from an invite.
Also tidied up assets folder, removed copy of fronted toolkit.

app/templates/register-from-invite.html

@@ -0,0 +1,34 @@
+{% extends "admin_template.html" %}
+
+{% block page_title %}
+Hello world!
+{% endblock %}
+
+{% block content %}
+
+<div class="grid-row">
+	<div class="column-two-thirds">
+		<h1 class="heading-xlarge">Create an account</h1>
+
+		<p>If you've used GOV.UK Notify before, <a href="">sign in to your account</a>.</p>
+
+		<p>
+		<label class="form-label" for="name-f1">Name</label>
+  		<input class="form-control-2-3" id="name-f1" type="text">
+  		</p>
+  		<p>
+  		<label class="form-label" for="mobile">Mobile phone number</label>
+  		<input class="form-control-1-4" id="mobile" type="text">
+  		</p>
+  		<p>
+  		<label class="form-label" for="password">Password</label>
+  		<input class="form-control-1-4" id="password" type="password">
+  		</p>
+
+  		<p>
+  		<a class="button" href="verify-mobile" role="button">Continue</a>
+  		</p>
+	</div>
+</div>
+
+{% endblock %}