Simplify script to recreate grammars (#624)

Author: Luni-4

recreate-grammars.sh

@@ -1,13 +1,10 @@
 #!/bin/bash
 
-# Enter enums directory
-pushd enums
+# Clean old grammars builds
+cargo clean --manifest-path ./enums/Cargo.toml
 
 # Recreate all grammars
-cargo clean && cargo run -- -lrust -o ../src/languages
-
-# Exit enums directory
-popd
+cargo run --manifest-path ./enums/Cargo.toml -- -lrust -o ./src/languages
 
 # Format the code of the recreated grammars
 cargo fmt