Write ETextbook Guide

[kilbouri]

What are you trying to accomplish?

Warn students about the totally dangerous and definitely enforced illegal websites for free textbooks

How are you accomplishing it?

Wrote a guide

Is there anything reviewers should know?

Definitely don't approve this PR

Checks before you create your pull request

• [x] Did you read and follow article requirements?
• [x] Did you run prettier?
• [x] Is it safe to rollback this change if anything goes wrong?

[jere-mie]

Let's wait to merge this and turn it into a full textbook guide rather than just an online textbook guide

[jere-mie]

closing because we already took care of this with the generic textbook guide