Cron job to automatically update Element

[gabrc52]

Or a similar solution to keep the webclient updated

[gabrc52]

Do this for the bridges too (git pull/download latest binary)

[gabrc52]

I am upping the priority because I won't magically remember to update the Element version... In the worst case scenario it would turn into one of the many SIPB instances of outdated software. Having Synapse updated would be nice too.

Bridges might be out of scope for P1