tools: add remark-lint configuration in .remarkrc
Checklist
-
commit message follows commit guidelines
Affected core subsystem(s)
tools, doc
Description of change
Specifies the configuration for remark-lint, a markdown linter.
This configuration will not cause any warnings on any of the currently present *.md
files (ignoring thirdparty), once https://github.com/nodejs/node/pull/7727 lands (hence blocked now).
It is useful not only for possible future tooling that would check the markdown files syntax, but also as a configuration for editor plugins, e.g. linter-markdown for atom-linter.
Issues fixed in #7637 and #7727 were mostly found using remark-lint.
/cc @nodejs/documentation @addaleax @silverwind @mscdex @Fishrock123.