feat: redirect by slug

db/migrations/20240512225208_add_slug_index_to_links.sql

@@ -0,0 +1,7 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+CREATE INDEX IF NOT EXISTS index_links_slug ON links (slug);
+
+-- +micrate Down
+-- SQL in section 'Down' is executed when this migration is rolled back
+DROP INDEX IF EXISTS index_links_slug;