Add codelab.fun/chat for the chat link

[kirjs]

What the issue is about

We have a slack chat channel.

Currently the entrypoint is http://nycjsorg.now.sh. While it works well, it's a bit misleading, and it would be amazing to have codelab.fun/chat as a URL.

What we want

A route /chat which would display a page which would invite people to our slack workspace (https://nycjsorg.slack.com/)

Where to start

• Read up on how to invite people to slack workspaced
• Root codelab routes are defined in app-routing.module.ts
• Ping @kirjs if you need any special accessss.