bun-pm-migrate: add page (#19977)

Author: msaf9

pages/common/bun-pm-migrate.md

@@ -0,0 +1,8 @@
+# bun pm migrate
+
+> Convert another package manager’s lockfile to a Bun-compatible lockfile without installing anything.
+> More information: <https://bun.com/docs/pm/cli/pm#migrate>.
+
+- Migrate the lockfile in the current project:
+
+`bun pm migrate`