db: add slug to team schema

prisma/migrations/20210813194355_add_slug_to_team/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Team" ADD COLUMN     "slug" TEXT;

prisma/schema.prisma

@@ -72,6 +72,7 @@ model User {
 model Team {
   id            Int       @default(autoincrement()) @id
   name          String?
+  slug          String?
   members       Membership[]
 }