Page for adding a new service

This page is exactly the same as the page for adding your first service, save
the heading text.

So all this commit does is:
- set up two routes (`/add-service`, `/add-service/first`) for each of the two
  journeys and change the existing journeys to use the `/add-service/first`
  route
- add logic to show different heading text depending on the journey
- add a link to the new (`/add-service`) route in the service chooser dropdown

app/main/views/add_service.py

@@ -1,4 +1,4 @@
-from flask import render_template, jsonify, redirect, session, url_for
+from flask import request, render_template, jsonify, redirect, session, url_for, abort
 from flask_login import login_required
 from app.main import main
 from app.main.dao import services_dao, users_dao
@@ -6,13 +6,25 @@ from app.main.forms import AddServiceForm
 
 
 @main.route("/add-service", methods=['GET', 'POST'])
+@main.route("/add-service/<string:first>", methods=['GET', 'POST'])
 @login_required
-def add_service():
+def add_service(first=False):
+    if first:
+        if first == 'first':
+            heading = 'Set up notifications for your service'
+        else:
+            abort(404)
+    else:
+        heading = 'Add a new service'
+
     form = AddServiceForm(services_dao.find_all_service_names())
     if form.validate_on_submit():
-
         user = users_dao.get_user_by_id(session['user_id'])
         services_dao.insert_new_service(form.service_name.data, user)
         return redirect(url_for('.dashboard', service_id=123))
     else:
-        return render_template('views/add-service.html', form=form)
+        return render_template(
+            'views/add-service.html',
+            form=form,
+            heading=heading
+        )

app/main/views/verify.py

@@ -20,5 +20,5 @@ def verify():
         verify_codes_dao.use_code_for_user_and_type(user_id=user.id, code_type='sms')
         users_dao.activate_user(user.id)
         login_user(user)
-        return redirect(url_for('.add_service'))
+        return redirect(url_for('.add_service', first='first'))
     return render_template('views/verify.html', form=form)