www: update checked html page

[richardlau]

After the switch to Next.js, /home/www/nodejs/en/index.html no longer exists.

[richardlau]

Since /home/www/nodejs/en/index.html no longer exists,

[ /home/dist/nodejs/release/index.json -nt /home/www/nodejs/en/index.html ]

was always true and the website was being rebuilt every 5 minutes (check-build-site.sh is run every 5 mins on a cron timer). Which is likely to be contributing to the server instability (cpu/mem usage and more frequent CDN purges).

[domdomegg]

This script isn't used for iojs anymore since that got turned into just a redirect. We can probably just strip that out to make this much simpler.

[domdomegg]

Fine for now. Can remove iojs bits as a separate PR.

[mhdawson]

LGTM