Add existing scripts

sql/drop_mytomes.sql

@@ -0,0 +1,5 @@
+DROP TABLE author_agents, author_publishers, book_authors, book_shelves, 
+    shelves, authors, publishers, user_publishers, reading_sessions, 
+    reviews, shelves, user_books, books, users;
+
+DROP TYPE "BookFormat", "ProgressType", "ReadingStatus", "TierType", "UserRole";