Fix budget types

[bakharzy]

• Removed organization-level budgets. This type of budget does not exist per GH newly published course: https://share.articulate.com/pmpueguUReJvPTq-7f_aY#/lessons/OGJRPBujjCiFDnCdRGCUJW3kXqt6tBsa
• Added individual-level budget option for power users.
• removed the link to how to create budgets. Those instructions are not updated for usage-based billing yet and thus incorrect and misleading.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
copilot/concepts/billing/usage-based-billing-for-organizations-and-enterprises.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@bakharzy I don't recognize your source as something officially from GitHub (maybe it is, but it's not obviously official), and I don't see a difference between "individual-level" and "user-level" billing. Plus "individual" isn't a term we use frequently in that context. Anyway, I'm asking about it for clarification.