tools: speed up lint-md-build

by using package-lock.json

PR-URL: nodejs#16945
Fixes: nodejs#16628
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: James M Snell <jasnell@gmail.com>

.gitignore

@@ -104,8 +104,8 @@ deps/npm/node_modules/.bin/
 
 # test artifacts
 tools/faketime
-tools/remark-cli
-tools/remark-preset-lint-node
+tools/remark-cli/node_modules
+tools/remark-preset-lint-node/node_modules
 icu_config.gypi
 *.tap