docs: overhaul SvelteKit guide

[benmccann]

What is it?

• Feature / enhancement
• Bug
• Docs / tests

Description

Changes:

• onMount should not be used. It's called on document load. For the GA example, that's too late
• write the scripts to SvelteKit's output directory rather than the user's source directory
• Remove the reverse proxying example. It's extremely confusing to show a reverse proxy with for GA because it conflicts with the GTM docs, which say a reverse proxy is not necessary
• Clarify that one step refers to svelte-preprocess, which is generally no longer used

Checklist:

• My code follows the developer guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• Added new tests to cover the fix / functionality

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Name	Status	Preview	Comments	Updated (UTC)
partytown	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 6, 2023 11:12pm