Removes unused migrations

internal/database/migrations/2_feed.sql

@@ -1,11 +0,0 @@
--- +migrate Up
-CREATE table feed (
-  id INTEGER PRIMARY KEY,
-  name text NOT NULL,
-  url text NOT NULL UNIQUE,
-  userId text NOT NULL,
-  FOREIGN KEY (userId) REFERENCES user(id)
-);
-
--- +migrate Down
-DROP TABLE feed;