removed all mention of nitro ads

[theoht]

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[gemini-code-assist]

Code Review

This pull request removes Nitropay ads and the Sponsor component from the documentation layout and components. The feedback suggests cleaning up the Toc component, which is now left with an empty frontmatter block and an empty div, or removing it entirely along with its references in other files.

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[gemini-code-assist]

The frontmatter block is now completely empty after removing the Sponsor import. Additionally, the component itself now only renders an empty div. Since Toc is still imported and rendered in src/pages/documentation/[slug].astro and src/pages/documentation/es/[slug].astro, consider removing this component entirely and cleaning up its references in those files. At a minimum, we should remove the redundant empty frontmatter block here.