Docs: Improve Syntax Highlighting

[niklas-wortmann]

Describe the problem that you experienced

Angular leverages embedded languages (have a combination of HTML, Typescript and CSS) in one file. A lot of syntax highlighter are not necessarily good with embedded language, this includes also highlighter js which is used in the new documentation.

Enter the URL of the topic with the problem

https://angular.dev/guide/components

Describe what you were looking for in the documentation

I'd expect HTML code to have HTML highlighting (+angular syntax for control flow syntax), the examples shown on that very page have Typescript syntax highlighting but not HTML for the template part.

Describe the actions that led you to experience the problem

Look at code examples in the new docs

Describe what you want to experience that would fix the problem

vs proper highlighting of the same code

Add a screenshot if that helps illustrate the problem

No response

If this problem caused an exception or error, please paste it here

No response

If the problem is browser-specific, please specify the device, OS, browser, and version

No response

Provide any additional information here in as much as detail as you can

I think this problem could be nicely solved by using [shiki](https://github.com/shikijs/shiki) which uses the textmate grammar files of the angular language server. It actually fetches the grammar files regular to be always up to date, in case there are additions (e.g. control flow)/fixes.
Shiki also comes with commonly used themes and has easy mechanisms to provide a custom theme.

[niklas-wortmann]

I integrated Shiki now in various projects, so I'd be more than happy to take care of that, if interested

[bencodezen]

Thanks for filing the issue @niklas-wortmann! I'll chat with the team to see what the plan is for this. Happy to loop you in if the plan is to use shiki or something.

[bencodezen]

Closing this issue in favor of consolidating into #52654

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