Markdown prevails on Katex when parsing a formula

[Azkellas]

Issue description

Issue description

When using katex to write math formulaes, it is first processed in markdown then in katex, resulting in many broken formulaes without any feedback from katex, as it didn't understand it was supposed to be its.

Minimum reproducible examples

$$

$$

The newline creates two empty paragraphs, instead of a katex block in a single paragraph.

$$ {a}\_1 + a\_{1} $$

The _ are not escaped, resulting in emphasis in markdown, instead of subscripts for katex.

$$
f(x) = x
* y
* z
$$

The * create a list in markdown, instead of a multiplication in katex.

...and so on.

Possible solution

For my website, I wrote two simple shortcodes to solve the issue:

<!-- texblock -->
$${{.Inner}}$$

and

<!-- texline -->
\({{.Inner}}\)

Then in markdown files, I first use {{< katex >}} to include katex, then either {{< texblock >}} or {{< texline >}} to write formulaes.

I'm new to hugo and congo, so this might not be the best solution or most elegant one (is it possible to automatically include katex if any tex shortcode is found?), but it does the job. I'm more than willing to do a PR if you want.

Note: bug previously mentioned in #586

Theme version

v2.6.1

Hugo version

v0.117.0

Which browser rendering engines are you seeing the problem on?

Chromium (Google Chrome, Microsoft Edge, Brave, Vivaldi, Opera, etc.), Firefox (Mozilla Firefox)

URL to sample repository or website

No response

Hugo output or build error messages

No response

[Azkellas]

So after a quick look at congo's codebase, I went ahead and made the PR, as it was simple enough for me to have a go. :)

[github-actions]

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