asciidoc support for Equations and Formulas (STEM)

### ⚠️ This issue respects the following points: ⚠️

- [X] This is a **enhancement/feature request**. Not a [bug or question](https://github.com/gsantner/markor/issues/new/choose).
- [X] The topic is **not** already reported at [Issues](https://github.com/gsantner/markor/issues?q=#js-issues-search). _(I've searched it)_.
- [X] Markor **is** up to date. See [Releases](https://github.com/gsantner/markor/tags) for the latest version. Updates are available from [F-Droid](https://f-droid.org/en/packages/net.gsantner.markor/) and GitHub.
- [X] The wanted feature/enhancement is not present in the latest development version (git master). (Please [download](https://nightly.link/gsantner/markor/workflows/build-android-project/master) and try the test version of Markor, named **Marder**. Don't worry; Markor and Marder appear as completely separate applications. You can install both side-by-side, and Markor's settings are not touched. If your desired feature is present, you don't need to open this issue. The change will be part of the next Markor update.)

### Description

1. Suport for Equations and Formulas in view mode in asciidoc with LaTeX and
AsciiMath

````
= My Diabolical Mathematical Opus
Jamie Moriarty
:stem: latexmath

.An e-xciting limit with LaTeX!
[stem]
++++
\lim_{n \to \infty}\frac{n}{\sqrt[n]{n!}} = {\large e}
++++

.A basic square root with AsciiMath
[asciimath]
++++
sqrt(4) = 2
++++
````

### Information

Android version: 13 ΤΡ1Α.220624.014
Device: POCO M4 Pro
App Version: v2.11

### Source

F-Droid

### Format / File type

Something else (-> Additional info)

### Additional info / Log

```shell
- acsiidoc
```

The request targets Markor's AsciiDoc view mode and supplies LaTeX and AsciiMath examples, but names no files or tests. Start by reproducing both examples in the app and tracing the existing AsciiDoc rendering entry point; done means both equation styles render correctly in view mode.

Written by the indexing model from the issue text.