Strip down wrangler.toml templates

[vicb]

What this PR solves / how to test

The wrangler.toml templates have 100+ lines of commented out template config.

I think it doesn't help users and potentially could make them think workers are more complex than they really are.

This is only a draft PR to get feedback.

What would be great is first to agree on the wording.

Then we should probably automatically inject the comments in all wrangler.toml instead of having to maintain 20 versions of those comments.

@irvinebroque @petebacondarwin thoughts?

Fixes N/A

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