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This reverts commit 36b53089.
This reverts PR #14065.

Turns out Glyphicons is more active than we'd thought.

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  - remarkable has 100% support for [commonmark](http://jgm.github.io/CommonMark/spec.html)
  - [faster](https://github.com/jonschlinkert/remarkable/tree/master/benchmark)
  - easier to monkeypatch. this is a goal of ours, might be useful to you at some point given the custom tokenizing/parsing you're doing for documentation.

Since `path.resolve` is using backslashes on Windows, we ended up with different files. Just replace those with forward slashes.

Refs #14118

Simplifies the build tooling a teeny bit.
This data file shouldn't need to be updated for v3 ever again.
This task will also be unnecessary in v4.

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Instead of our homegrown grunt/shrinkwrap.js
Fixes #13483.
New npm-shrinkwrap.json is human-readable but still in a consistent/stable format.
Should aid debugging, produce better diffs, and be less prone to merge conflicts

Be more consistent across the whole codebase.

Also, make use of JSHint's 2.5.1 `extends` and `qunit` options. This way we set our basis options in js/.jshintrc and override the rest.

Closes #12987