Add Status Page link to README / and/or website

[bmuenzenmeyer]

Enter your suggestions in details:

Today I learned that we had a status page at https://status.nodejs.org/ - I see nodejs/build#2265 but no real mention of teaching people about it. I've been involved with the project for over a year and first learned about it.

Also, I acknowledge that putting on the site (or maybe just the README) is ironic if the site itself is down. Relates to nodejs/build#2265 (comment)

If nothing else, this helps people learn about this communication tool for status and for resolutions.

[AugustinMauroy]

+1 to put on:

• Readme
• And on a new part of about section. Which would contain :
  • What are node's official domain names => so any binary that doesn't come from there can be malicious
  • Which npm packages are maintained by node
  • If there are problems with the node website either issue on node/nodejs.org or downtime => link to status page