Billing (#1269)

* Change env SELF_HOSTING_ENABLED to SELF_HOSTED

* Initial Stripe implementation

* Fix portal link

* Use webhook signatures

* Migrated to new Stripe gem conventions

Also updated resource routing

* Added faraday-multipart gem to resolve middleware notice

* Merge fix

* Merge fix

* Temporary upgrade prompt for early access

* Lint fix

* i18n fixes

* Remove catch-all rescue

* Update .env.example

config/locales/views/settings/en.yml

@@ -1,8 +1,16 @@
 ---
 en:
   settings:
+    billings:
+      show:
+        manage_subscription_button: Manage subscription
+        page_title: Billing
+        subscribe_button: Subscribe
+        subscription_subtitle: Manage your subscription and billing details
+        subscription_title: Manage subscription
     nav:
       accounts_label: Accounts
+      billing_label: Billing
       categories_label: Categories
       feedback_label: Feedback
       general_section_title: General

config/locales/views/shared/en.yml

@@ -13,6 +13,12 @@ en:
       no_account_subtitle: Since no accounts have been added, there's no data to display.
         Add your first accounts to start viewing dashboard data.
       no_account_title: No accounts yet
+    subscribe_prompt:
+      guarantee: We're reasonable people here. If you're not happy or something doesn't
+        work, we'll gladly refund you.
+      subscribe: Upgrade your account
+      subtitle: To continue using Maybe, please subscribe!
+      title: Upgrade
     upgrade_notification:
       app_upgraded: The app has been upgraded to %{version}.
       dismiss: Dismiss