Support LaTex formulas embedded in markdown using mathjax

[lucasvo]

We'd like to be able to embed formulas into our markdown docs using MathJax similarly to how HackMD is doing it (e.g. https://hackmd.io/features#MathJax).

The following is an example of how formulas can be embedded in Markdown:

The *Gamma function* satisfying $\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$ is via the Euler integral

$$
x = {-b \pm \sqrt{b^2-4ac} \over 2a}.
$$

$$
\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.
$$

Acceptance Criteria:

• Adding any LaTex Math Formula to the markdown content should render the formula properly on the site when built with gatsby. Use the above example for testing.
• If any libraries that we rely on have to be modified, please submit separate pull requests to the upstream projects and do your best to ge them merged.

This issue has a gitcoin bounty attached to it. If you'd like to start working on it, feel free to reach out to me (lucas@centrifuge.io) directly, join our slack channel #bounties on our slack

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

These users each claimed they can complete the work by 6 days, 10 hours from now. Please review their action plans below:

1) eswarasai has started work.

Will try to closely replicate the HackMD handling for MathJax in the MD docs. Thanks!

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[eswarasai]

@lucasvo - I've used KaTex instead of LaTex and seems to be working fine with the existing Gatsby setup as per mentioned here -- https://mdxjs.com/guides/math-blocks

I've created a PR with the above example rendered in Introduction which looks like below screenshot:

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work for 300.0 DAI (300.0 USD @ $1.0/DAI) has been submitted by:

1. @eswarasai

@lucasvo please take a look at the submitted work:

• PR by @eswarasai

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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