fix: update api import paths & fix Dockerfile not copying frontend build

fixes issue #7 & #9

also remove agGrid dependency from package.json to reduce download size

cmd/citadel/main.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"github.com/jordanknott/project-citadel/api/internal/commands"
+	"github.com/jordanknott/project-citadel/internal/commands"
 	_ "github.com/lib/pq"
 )