[New Docs]: Add contributors page

[timdeschryver]

Information

The new website doesn't have an "About" page.
We should create one similar to https://ngrx.io/about.
This page can also be included in the footer.

Documentation page

No response

I would be willing to submit a PR to fix this issue

• Yes
• No

[omenmn]

add some information on where and how to contribute please.

[DuskoPeric]

.

[timdeschryver]

@omenmn sorry I missed your comment.
@DuskoPeric will pick this one up.