[javascript] began reworking token handling to match what is done with the haskell client

nodejs/database/000_init.sql

@@ -1,8 +1,7 @@
 CREATE TABLE schema_version (
 	version INTEGER NOT NULL
 );
-CREATE TABLE config (
+CREATE TABLE tokens (
 	id INTEGER PRIMARY KEY,
-	key TEXT NOT NULL UNIQUE,
-	value TEXT NOT NULL
+	data TEXT NOT NULL
 );