add and populate header and footer HTML templates.

The HTML is basic, just to get the sections to a usable state.

templates/layouts/footer.html

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+<hr>
+© 2018 - {% lisp (local-time:timestamp-year (local-time:now)) %} Nicola Ellis
+

templates/layouts/header.html

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+<div>
+    {% if roles.logged-in %}
+    <a href="/dashboard">Dashboard</a>
+    <a href="/user/edit">Edit Account</a>
+    {% if roles.administrator %}
+    <a href="/site-settings">Site Settings</a>
+    {% endif %}
+    <form action="/logout" method="post">
+	<input required type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
+	<input type="submit" value="Log Out">
+    </form>
+    {% endif %}
+</div>
+<div>
+    {% ifequal system-data.first.enable-site-logo 1 %}
+    <img alt="{{system-data.first.site-name}}"
+	 src="/images/site-logo.png">
+    {% endifequal %}
+    <h1>{{system-data.first.site-name}}</h1>
+</div>
+
+<div>
+    <nav>
+	{% for page in system-data.last.first %}
+	{% ifequal page.enable-nav-menu 1 %}
+	{% if page.slug == "login" %}
+	<a href="/{{page.slug}}">{{page.title}}</a>
+	{% elif page.slug == "home" %}
+	<a href="/">{{page.title}}</a>
+	{% elif page.slug == "archive" %}
+	<a href="/{{page.slug}}">{{page.title}}</a>
+	{% elif page.slug == "pages" %}
+	<a href="/{{page.slug}}">{{page.title}}</a>
+	{% elif page.slug == "sign-up" %}
+	<a href="/{{page.slug}}">{{page.title}}</a>
+	{% else %}
+	<a href="/view/page/{{page.slug}}">{{page.title}}</a>
+	{% endif %}
+	{% endifequal %}
+	{% endfor %}
+    </nav>
+</div>
+</div>
+<hr>