"Additonal description" text does not appear in invitation emails

[biggianteye]

Description of the issue 📄

The workshop creation page has an "Additional description" text box to allow you to add some workshop-specific information. This appears at the top of both the public and organiser workshop pages. However it does not appear in invitation emails. Only information from the host level (eg. address, directions, accessibility information) are there. Given that this might be really important information and invitation emails are our first touchpoint, I think it should be included there as well.

Screenshots 📷

Steps to fix 🛠

To do 📋

• Claim this issue (comment below, or assign yourself if you are part of the codebar org)
• Fork and clone the repository
• Update the relevant files. Follow the steps to fix section in this issue.
• Commit your changes as one commit. Use the title of this issue as your commit message
• Submit a pull request
• Mention this issue in the PR description by including it's number
• Have your pull request reviewed & merged by a codebar team member