Add versions grid

[dhobi]

• Add versions.php to web app which shows available library versions for each heroku stack
• Link to this versions.php from the "main" page
• Eat your own dog food by using Relay (with free Upstash for Redis addon) to cache remotely fetched packages.json (save costs, lower response times 😄 )

Demo (Click on: See all versions)
https://php-extensions-v3-a77bf5bcde1d.herokuapp.com/

[tillkruss]

Thanks! It shows an application error, can you see whats going on?

[dhobi]

Yes, sorry, I'm running on heroku ECO dynos and they ran out of compute time towards the end of last month. It's back now!

Unrelated: I'm also trying to put together a heroku-26 PR. Seems like they changed some bits here and there in https://github.com/heroku/heroku-buildpack-php and I'm not sure if everything is already in place on their side so it might take a while...