Use https://metro.js.org instead of https://metro.muze.nl?

[Potherca]

The current domain for this project is https://metro.muze.nl/

If desired, https://metro.js.org/ could be used, as it is still available.

Needed steps:

• Change the CNAME file to metro.js.org
• Make a pull request that adds "metro": "muze-nl.github.io/metro", to https://github.com/mjkoo/js.org/blob/master/cnames_active.js

Pro:

• Popular and recognizable domain name

Con:

• Domain not under our control

@poef Yay / Nay?

[poef]

I like the idea behind js.org, but for now I would like to keep all our stuff on our domain. So implement something like js.org on docs.muze.nl. This is partly marketing, but also there are hopefully going to be a lot of cross links between our different libraries' documentation pages. It makes more sense to me to have that happening on a single domain we own ourselves...

[Potherca]

We could make a separate "promo" landingpage that gives an high-level overview and lists all available packages in the Metro family, and serve that at metro.js.org?

That way, we have the main / large websites under metro.muze.nl, and a light / promo version on metrojs.org.