chore(git): remove committed dot binary and unignore exception

bin/dot was tracked via a !bin/dot gitignore exception despite being a
build artifact. No install path or CI workflow used the committed binary;
all consumers build from source or download from GitHub Releases.

Author: mathieusouflis

.gitignore

@@ -18,7 +18,6 @@ __pycache__/
 dist/
 build/
 bin/*
-!bin/dot
 out/
 target/