Remove note about yarn from npm ci command

If a project uses `yarn` it should not use the `npm ci` command in CI!

Author: mokagio

bin/install_npm_packages_clean

@@ -7,7 +7,6 @@ if [ ! -f package.json ]; then
 fi
 
 # Ensure package-lock.json is present
-# TODO: What to do with yarn-based projects? Make the hash on lockfile optional?
 if [ ! -f package-lock.json ]; then
     echo "No package-lock.json found!"
     exit 1