ansible: remove website build config from www-standalone

[targos]

Website is now built and deployed on Vercel infra

Refs: #3636

[targos]

To do after this is approved/merged (please tell me if something here seems wrong):

• rm /home/nodejs/build-site.sh
• rm /home/nodejs/check-build-site.sh
• rm /home/nodejs/github-webhook.log
• rm /home/nodejs/github-webhook.log.* (logrotate archives)
• rm /usr/bin/github-webhook
• rm -rf /usr/lib/node_modules/github-webhook
• rm /etc/github-webhook.json
• rm /lib/systemd/system/github-webhook.service && systemctl daemon-reload (already disabled)
• rm /etc/logrotate.d/github-webhook

[MattIPv4]

👀 Is it worth cleaning up some of the Next.js-specific stuff in the NGINX config for nodejs.org while we're here, or leaving that as a future exercise?

[targos]

I don't like to extend the scope of a change that was not trivial to make and think about.