User Onboarding + Bug Fixes (#1352)

* Bump min supported date to 20 years

* Add basic onboarding

* User onboarding

* Complete onboarding flow

* Cleanup, add user profile update test

db/migrate/20241022221544_add_onboarding_fields.rb

@@ -0,0 +1,7 @@
+class AddOnboardingFields < ActiveRecord::Migration[7.2]
+  def change
+    add_column :users, :onboarded_at, :datetime
+    add_column :families, :date_format, :string, default: "%m-%d-%Y"
+    add_column :families, :country, :string, default: "US"
+  end
+end