Remove unused sfbuild Makefile target

The sfbuild target was a duplicate of build wrapped with the Symfony CLI.
It was not referenced anywhere (CI, docs, Dockerfile) and was the only
reason composer.phar was committed in the repo.

https://claude.ai/code/session_01Y23jrgXnJ6Av6Gf6LdwhMx

Author: claude

Makefile

@@ -44,12 +44,6 @@ build: ## it launches all the build
 	bin/psalm.phar --no-cache
 	bin/phpunit
 
-sfbuild: ## it launches all the build
-	symfony composer install
-	PHP_CS_FIXER_IGNORE_ENV=1 symfony php bin/php-cs-fixer fix -v
-	symfony php bin/psalm
-	symfony php bin/phpunit
-
 dt: ##it launches tests using container
 	docker run --rm -it --entrypoint= -v $(PWD):/arkitect phparkitect make test