Add Discord to the iD sidebar

[ForgottenHero]

Could we please add the OpenStreetMap Discord to the sidebar of the iD editor alongside the Slack, Wiki, Facebook, Reddit, etc?

OSM World
https://discord.gg/SRZUYUz
Get in touch with other mappers via Discord

[bhousel]

Whom should I list as the contact for the Discord group?

Once we determine this, steps would be almost the same as I wrote for:
#178 (comment)

[ForgottenHero]

The user 'Zandu' is the owner of the server.

[bhousel]

The index entry needs a contact name and email.

[bhousel]

I heard back from Austin, who operates the discord channel! The task here is to:

1. create a new resource file resources/world/OSM-Discord.json:

{
  "id": "OSM-Discord",
  "type": "discord",
  "languageCodes": ["en"],
  "name": "OpenStreetMap Discord",
  "description": "Get in touch with other mappers via Discord",
  "url": "https://discord.gg/SRZUYUz",
  "contacts": [{"name": "Austin Harrison", "email": "jaustinharrison@gmail.com"}]
}

2. run npm run build to ensure that checks pass and regenerate built files

If all looks good, submit a Pull Request. Thanks!