docs: review the theming documentation

[tilucasoli]

Description

• Some items on this documentation were deprecated.

Changes

• I remove the extensions of TokenUtil

Review Checklist

• [ ] Testing: Have you tested your changes, including unit tests and integration tests for affected code?
• [ ] Breaking Changes: Does this change introduce breaking changes affecting existing code or users?
• [x] Documentation Updates: Are all relevant documentation files (e.g. README, API docs) updated to reflect the changes in this PR?
• [ ] Website Updates: Is the website containing the updates you make on documentation?

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Name	Status	Preview	Comments	Updated (UTC)
mix-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 7, 2024 4:10pm