Delete resource/migrate.sql (#3070)

the new cdb schema is being discussed in https://github.com/Fluorohydride/ygopro/pull/3044

and this *middle* format is nowhere used.

This file may be reintroduced in that PR.

resource/migrate.sql

@@ -1,20 +0,0 @@
---step 1: add new column
-ALTER TABLE datas ADD COLUMN rule_code INTEGER DEFAULT 0;
-
---step 2: update "treated as X" cards
-UPDATE datas
-SET rule_code = alias, alias = 0
-WHERE id IN (
-    SELECT id
-	FROM datas
-    WHERE NOT (type & 0x4000) AND alias != 0 AND abs(id - alias) >= 20
-);
-
---step 3: update special cards
-UPDATE datas
-SET rule_code = alias, alias = 0
-WHERE id = 5405695;
-
-UPDATE datas
-SET rule_code = 13331639
-WHERE alias = 6218704;