doc: add eslint-plugin-markdown

* install eslint-plugin-markdown
* add doc/.eslintrc.yaml
* add `<!-- eslint-disable rule -->` or `<!-- eslint-disable -->`
  for the rest of problematic code
* .js files in doc folder added to .eslintignore
* update Makefile and vcbuild.bat

PR-URL: https://github.com/nodejs/node/pull/12563
Refs: https://github.com/nodejs/node/pull/12557#issuecomment-296015032


Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>