docs(js): Use split layout in Angular & SvelteKit quick start guide

[inventarSarah]

DESCRIBE YOUR PR

This branch updates the following quick start guides to use the new split layout:

• Angular wizard
• Angular manual setup
• SvelteKit wizard
• SvelteKit manual setup
• SvelteKit on Cloudflare

I created temporary include files for tunneling and source maps content (which I will clean up once all guides are updated). I then also updated the Browser JS quick start guide to use these new include files.

Closes: #17187

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Project	Deployment	Actions	Updated (UTC)
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[coolguyzone]

Looks good, thanks for updating these!

[JPeer264]

Uh that looks way better. Thanks for updating

[Lms24]

Content-wise, this LGTM. I agree that it looks a bit better than before. However, I think we have some opportunities to clean up a lot of wasted space in the manual setup guides. For example, the CTAs to log in seem highly duplicated and push down the code blocks quite a bit:

Doesn't have to block this PR as this likely is a problem everywhere. But long-term, we should come up with a smarter concept here how to display this.

[inventarSarah]

@Lms24

However, I think we have some opportunities to clean up a lot of wasted space in the manual setup guides. For example, the CTAs to log in seem highly duplicated and push down the code blocks quite a bit

Yes, these come from the Code block component and are everywhere.
I took a closer look, and it doesn't appear to be working as intended. For example, it shouldn't appear in the code block on your screenshot, since there's no config to replace in it. (This is also the case in master branch)
I'll create a new issue for this, thanks!