Fix EduTemplate Regex to Exclude Template Keys in HTML Comments

[jvillemare]

Due Date: Backlog

Description: If a Template ¶key is inside of an <!-- HTML comment -->, then ignore it. In templates.py, update the EduTemplate class to modify the regex pattern of string.Template to exclude HTML comments.

Objectives:

• [ ] Come up with regex, I recommend using regex101.com on the Python setting to test it
• [ ] Add it to EduTemplate class
• [ ] PR
• [ ] Schmoney

[jvillemare]

Reassigning @vivatheest