[Refactor] Split index.html to base.html and welcome.html

app/__init__.py

@@ -32,7 +32,7 @@ app = CalendarSocialApp(__name__)
 
 @app.route('/')
 def hello():
-    return render_template('index.html')
+    return render_template('welcome.html')
 
 
 if __name__ == '__main__':

app/templates/welcome.html

@@ -0,0 +1,5 @@
+{% extends 'base.html' %}
+
+{% block content %}
+<p>Welcome to Calendar.social.  There will be lot of content here soon!</p>
+{% endblock content %}