fix(build): don’t run git add when linting

because if you only want to commit a couple of lines of a file, this will cause the whole file to be committed.

[ci skip]

.lintstagedrc.json

@@ -1,3 +1,3 @@
 {
-  "*.ts": ["prettier --write", "git add"]
+  "*.ts": ["prettier --write"]
 }