Added allprojects.njk that lists all projecs (pagination), added contributing.md that has instructinos about adding your project to neoBeta, added errors template and 404 page, moved projects metadata to json file.

_includes/error.njk

@@ -0,0 +1,11 @@
+---
+layout: "base.njk"
+---
+<h2>{{ page.fileSlug }} - Ouch! We hit a wall.</h2>
+<p>{{ errorDescription | safe }}</p>
+{% if errorQuote %}
+<p class="errorQuote"><i>"{{ errorQuote | safe }}"</i></p>
+{% endif %}
+{% if content %}
+{{ content | safe }}
+{% endif %}