remove wsgi.py - always serve with whitenoise

We're now running our app as a wsgi app locally, so don't need to
distinguish between the two processes by having wsgi and application.py
whitenoise just serves static files nicely - we don't lose anything
by doing that locally.

application.py

@@ -1,6 +1,15 @@
+import os
+
 from flask import Flask
+from whitenoise import WhiteNoise
+
 from app import create_app
 
+PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
+STATIC_ROOT = os.path.join(PROJECT_ROOT, 'app', 'static')
+STATIC_URL = 'static/'
+
 app = Flask('app')
 
 create_app(app)
+application = WhiteNoise(app, STATIC_ROOT, STATIC_URL)