Migrate from lockbox to ActiveRecord encryption (1/2)

.env.example

@@ -1,6 +1,14 @@
 # PRIMARY_DOMAIN=kosmos.org
 # AKKOUNTS_DOMAIN=accounts.example.com
 
+# Generate this using `rails secret`
+# SECRET_KEY_BASE=
+
+# Generate these using `rails db:encryption:init`
+# (Optional, needed for LndHub integration)
+# ENCRYPTION_PRIMARY_KEY=
+# ENCRYPTION_KEY_DERIVATION_SALT=
+
 # The default backend is SQLite
 # DB_ADAPTER=postgresql
 # PG_HOST=localhost