Beta Testing Round 3 Bug Fixes (#1357)

* Clean up env example files

* Fix duplicate category creations

* Fix duplicate tag and merchant creation

* Add initial valuation to imported accounts

* Add upgrade modal prompt

* Don't hide content on billing page

* Add temporary session for new customers

* Lint fixes

* Fix unused translations

* Fix system tests

app/models/demo/generator.rb

@@ -71,7 +71,8 @@ class Demo::Generator
         first_name: "Demo",
         last_name: "User",
         role: "admin",
-        password: "password"
+        password: "password",
+        onboarded_at: Time.current
     end
 
     def create_tags!