Add dataset selection with validation

app/templates/data.html

@@ -1,15 +1,12 @@
 {% extends "base.html" %}
+{% import 'bootstrap/wtf.html' as wtf %}
 
-{% block content %}
-<h1 class="text-center">How you like your data?</h1>
-<li>
-    <p class="text-center">
-        <a href="{{ url_for('map_view') }}" class="btn btn-success" role="button" aria-pressed="true">Maps</a>
-    </p>
-</li>
-<li>
-    <p class="text-center">
-        <a href="{{ url_for('plot_view') }}" class="btn btn-success" role="button" aria-pressed="true">Plots</a>
-    </p>
-</li>
+{% block app_content %}
+<h1>Select a dataset</h1>
+<div class="row">
+    <div class="col-md-4">
+        {{ wtf.quick_form(form) }}
+    </div>
+</div>
+<br>
 {% endblock %}