Add equivalent of "sessionInfo" to the output PDF

[nuest]

All information of the pinned environment.

Maybe the output of pip?

[dxL1nus]

• show session information in certificate PDF (https://gitlab.com/joelostblom/session_info or https://github.com/scverse/session-info2)

[dxL1nus]

The session information is now shown correctly. See here. Please tell me if this looks good.

[nuest]

Looks great! #12 will close this issue then, right?

[nuest]

Closed by #12