Remove Makefile

The Makefile was deleted from the repository as Castor is now used.

Author: Spomky

.gitattributes

@@ -15,7 +15,6 @@
 /deptrac.yaml export-ignore
 /ecs.php export-ignore
 /infection.json export-ignore
-/Makefile export-ignore
 /phpbench.json export-ignore
 /phpstan.neon export-ignore
 /phpstan-baseline.neon export-ignore