Feature: Add option to ignore languages

[lacrioque]

Short:

Added an option to skip language highlighting.

Reason:

While working on an internal documentation system, we came across an issue with mermaid-graph rendering and language highlighting. We wanted highlighting for the code examples, but the mermaid graphs should be painted.
There was no easy way to achieve this, through editing the Prism configuration, so I added an option to filter out specific languages from being rendered out.

Solution:

Additional optional setting `languageFilter´.
Default assignment is an empty array, so it will not impact running Installations. This change should be fully backwards compatible.
In the highlighting modules (HighlightPairedShortcode, markdownSyntaxHighlightOption) the language will be checked before any linting, or reading action. It checks if the language is included in the option array. If it is a plain "

" will be returned with the language as class and any additional preAttributes set as option.

[zachleat]

Hey, just reading the Mermaid docs https://mermaid-js.github.io/mermaid/#/usage it looks like any element with class="mermaid" on it gets passed to the mermaid API—how do you differentiate between a code block that wants to be syntax highlighted in mermaid and a code block that should be rendered in mermaid? Also reviewing https://traveling-coderman.net/code/eleventy-mermaid/ which seemed to use a mermaid-graph lang

I’m also curious if #50 already solved this without filtering.

[zachleat]

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