Show Python Version (and Package Environment?) in Version Overview

[ctreffe]

As a logged in user, you can see the alfred3 version, the alfred3-interact version, and the mortimer version in the lower left corner of your screen in mortimer. As mortimer can potentially run on multiple servers with different python environments, it would be great to see which version of Python mortimer runs on.

Additionally, maybe we can add a version overview, showing the whole package environment on a separate site, to the left sidebar in mortimer. This can be especially helpful when debugging alfred online experiments on a local machine, as errors are often caused by the older python or package versions on our current server (running on an antique python 3.7.3 environment).