Upgrade mathematical formulae if/where needed in docs

[ckormanyos]

Use better SVG representations to upgrade mathematical formulae if/where needed in docs.

[ckormanyos]

Markdown supports significant LaTeX syntax out of the box now with $$ syntax, such as:

Some math: $\sqrt{x^2+y^2}$,

which is written as:

$\sqrt{x^2+y^2}$

Using these features may be a good way to go.

[ckormanyos]

See also this blog post.

Let's try it again with $\sqrt{x^2 + y^2}$.

Or let's try again, this time centering this equation with: $$\sqrt{x^2 + y^2}$$