doc: remove outdated link

The community maintained material hasn't been updated for
almost five years, corresponds to Node 0.11, and is no longer
accurate. This commit removes the references.

PR-URL: https://github.com/nodejs/node/pull/27126


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>