Automate Let's Encrypt certs on renewals on Discourse

[gregkare]

[rosano]

@raucao if this is taken care of in discourse maybe close in favour of #53 ?

[raucao]

The title here also says "Discourse", but I don't remember having to manually update any certs for that recently.

@gregkare Maybe this was already done, but not closed?

[raucao]

@gregkare Looks like you may have missed my question there?