merge shop and looted tables

lootalot_db/migrations/2019-06-10-123922_create_items/up.sql

@@ -5,8 +5,8 @@ CREATE TABLE items (
   base_price INTEGER NOT NULL
 );
 
--- The items that have been looted
-CREATE TABLE looted (
+-- The loot
+CREATE TABLE loot (
   id INTEGER PRIMARY KEY NOT NULL,
   name VARCHAR NOT NULL,
   base_price INTEGER NOT NULL,
@@ -14,9 +14,3 @@ CREATE TABLE looted (
   FOREIGN KEY (owner_id) REFERENCES players(id)
 );
 
--- The items that are available in shop
-CREATE TABLE shop (
-  id INTEGER PRIMARY KEY NOT NULL,
-  name VARCHAR NOT NULL,
-  base_price INTEGER NOT NULL
-);