tools: re-implement lint-md without unified-args

`unified-args` ignores settings in the preset, expecting them to be in
remarkrc files or passed on the command line instead. Realizing that
we always send the same configuration options via the command-line
anyway, this removes `unified-args`. This means the preset settings are
now respected and it removes nearly 30000 lines of code in the resulting
rollup file.

I wasn't sure I was going to want to keep rollup so I started
re-implementing this without it, but ended up putting a minimal rollup
back as it still saves about 90000 lines of code vs. checking in
`node_modules`.

PR-URL: https://github.com/nodejs/node/pull/40180


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>