Need rich text functionality in the quiz/mini-quiz components.

At the moment, we don't have any rich text functionality in the quizzes and mini-quizzes. But we are limited to using quotes and back ticks, which is a bit ugly/messy, and it means we can't have good and predictable writing conventions.

Sometimes we need to highlight a `piece of code` in the questions and possible answers, so that it is quickly identifiable to and easy to differentiate from other text for the learner:
Q. What does the `tokenTier` mapping do?
A. It maps the token ID to its corresponding tier.
A. It maps `tokenTier` to the `totalSupply`.

Sometimes we want to highlight a word, where *italics* would be appropriate:
Q. What does the term *gas* refer to in the context of Ethereum?

Sometimes we need text in **bold** to really stress something.....that we really want to stress.
Q. What is a private key?
A. A key that gives total access to whomever holds it to have **full control** of an account and its assets

And then we need to agree on when and where to use them (so we can add a footnote to our lesson template guidelines doc)