Using `create-mdx` with something like `x0` will create a project called `next-mdx`

[wooorm]

Subject of the issue

I believe name should, when example is given, be based off of that:

mdx/packages/create-mdx/cli.js

Line 4 in 352264f

const [example = 'next', name = 'next-mdx'] = process.argv.slice(2, 3)

Steps to reproduce

npm init mdx x0

Expected behaviour

ls should include x0-mdx or something.

Actual behaviour

ls includes next-mdx.

[wooorm]

In fact, .slice(2, 3) only returns the value at 2. So name is never set.