Add a component for picking the time to send a job

Users need to pick a time in the next 24hrs, or send a file immediately.

Rationale for this is a bit lost in time-before-holiday, but generally:

‘Now’ and ‘later’ as the inital choices makes it really clear what
this feature is about conceptually.

The choice of times is absolute, eg ‘1pm’ not ‘in 3 hours’

app/main/views/index.py

@@ -31,7 +31,7 @@ def cookies():
 
 @main.route('/trial-mode')
 def trial_mode():
-    return render_template('views/trial-mode.html')
+    return render_template('views/trial-mode.html', hours=hours)
 
 
 @main.route('/pricing')