Update the Deno website URL on the GitHub repoository's "About" section

[matthewjnield]

The Deno website's URL has been updated from "deno.land" to "deno.com". This repository's "About" section still lists the website's URL as "deno.land". This still redirects to the webpage, but it may be a good idea to update this to the current URL.

Here is the URL currently being displayed in the "About" section, displaying the old URL:

Here is the "About" section of the main Deno repository, displaying the current URL: