Get new Mentoring banner printed for DrupalCon Europe

Problem/Motivation

A new banner was created for DrupalCon NA, but the European one is still the old design.

The Slack Channel name has changed since the design was created for NA, so that also needs updating.

Proposed resolution

Update the Slack channel on the banner design.
Get printed and added to the Mentoring box with Kuoni.

Remaining tasks

• Update Slack channel on banner design (suggest to change to #first-contribution)
• Confirm team are happy with updated design
• Find a printer who are able to print and ship to Kuoni
• Get someone to put it on their credit card and place order
• Erect at DrupalCon Vienna and bask in its loveliness

User interface changes

The Mentoring booth is a key part of how the mentoring team engage with the wider contribution community at DrupalCon, so updating the banner is important to keep our image up to date.