Add blog post hint on writing formula

First in the series responding to #532.

<strong data-sourcepos="3:4-3:116">I need a cloud tool that allows to collaboratively write/edit scientific formulas. LaTeX syntax would be fine</strong>

Suggest to use a specific category for this type of blog post. Because it's a bit modest for Tutorial. I chose Hint so far, but better ideas welcome!

• 👉 Review blog post here
• 👉 Review excerpt here

@laura.marie.holz @SpickerHZB @jandt-desy what do you think?