Add ‘How to pay’ page

Content from https://docs.google.com/document/d/1uIFW8c7Vk0-FQ-d8H1FmNZLHKn_tOXWg5oUL8bbcZzw/edit?ts=5ced1ae4#

app/main/views/index.py

@@ -15,6 +15,7 @@ from notifications_utils.template import HTMLEmailTemplate, LetterImageTemplate
 from app import email_branding_client, letter_branding_client, status_api_client
 from app.main import main
 from app.main.forms import FieldWithNoneOption, SearchByNameForm
+from app.main.views.feedback import QUESTION_TICKET_TYPE
 from app.main.views.sub_navigation_dictionaries import features_nav
 from app.utils import get_logo_cdn_domain
 
@@ -78,6 +79,14 @@ def pricing():
     )
 
 
+@main.route('/pricing/how-to-pay')
+def how_to_pay():
+    return render_template(
+        'views/pricing/how-to-pay.html',
+        support_link=url_for('main.feedback', ticket_type=QUESTION_TICKET_TYPE)
+    )
+
+
 @main.route('/delivery-and-failure')
 def delivery_and_failure():
     return redirect(url_for('.message_status'), 301)