meta: use contact_links instead of issue templates

To redirect people to the help and website repos.

PR-URL: https://github.com/nodejs/node/pull/30172
Refs: https://github.blog/changelog/2019-10-28-new-issue-template-configuration-options/


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>