Adding Upload page

Added templates for main pages
Updated Nav urls
Made error page prettier

templates/settings.html

@@ -0,0 +1,10 @@
+{% extends 'layout.html' %}
+{% block content %}
+    <header>
+        <img src="{{ url_for('static', filename='images/leaves.jpg') }}" alt="leaves"/>
+        <span></span>
+    </header>
+    <div class="app">
+        <h1>Settings</h1>
+    </div>
+{% endblock %}