docs(js): Use split layout in browser JS quick start guide

[inventarSarah]

DESCRIBE YOUR PR

This is the first in a series of PRs to update all JS quick start guides to the new split layout.

I'm starting with a single guide to validate the approach with @sergical before proceeding.

Note:
I had to inline some includes temporarily since the include files are shared across multiple guides. I will update and use them again once all guides are updated.

Closes: #16903

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[inventarSarah]

Should we move the other 2 options into the split layout?

It looks better to me this way

[sentry]

Bug: A shared include file, getting-started-config/javascript.mdx, was wrapped in a <SplitLayout>, which will break the layout for non-browser guides like Node.js that use it.
_{Severity: MEDIUM}

Suggested Fix

Instead of modifying the shared include file directly, wrap the <SplitLayout> component within the file with a <PlatformSection platform="javascript.browser">. This will ensure the split layout only renders for browser-based guides and does not affect Node.js or other server-side framework documentation.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: platform-includes/getting-started-config/javascript.mdx#L1-L4

Potential issue: The shared include file
`platform-includes/getting-started-config/javascript.mdx` has been entirely wrapped in a
`<SplitLayout>` component. This file is used by various JavaScript guides, including
those for Node.js and other server-side frameworks. These non-browser guides do not use
the necessary parent layout components that `<SplitLayout>` requires. As a result, when
these guides include the modified file, the layout will render incorrectly, leading to a
broken visual presentation for users viewing the Node.js or server-side framework quick
start documentation.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[inventarSarah]

I didn't find any other guide that uses this file so it should be fine.

We could inline the content just to be safe

[sergical]

i dig it!