Add and delete migration files

sql/countries.sql

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+INSERT INTO "worldTravelCountries" (name, country_code, continent)
+VALUES
+  ('United States', 'us', 'North America'),
+  ('Canada', 'ca', 'North America'),
+  ('Mexico', 'mx', 'North America'),
+  ('Brazil', 'br', 'South America'),
+  ('Argentina', 'ar', 'South America'),
+  ('United Kingdom', 'gb', 'Europe'),
+  ('Germany', 'de', 'Europe'),
+  ('France', 'fr', 'Europe'),
+  ('Japan', 'jp', 'Asia'),
+  ('China', 'cn', 'Asia'),
+  ('India', 'in', 'Asia'),
+  ('Australia', 'au', 'Oceania'),
+  ('New Zealand', 'nz', 'Oceania'),
+  ('South Africa', 'za', 'Africa'),
+  ('Egypt', 'eg', 'Africa');