Enhancement: Title suggestion AI for sponsors

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Enable a title suggestion AI for sponsors only.

Screen.Recording.2023-03-18.at.21.16.13.mov

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If you are a GitHub sponsor, you can now enable the frontMatter.sponsors.ai.enabled setting (in the beta) to get title suggestions for the content you want to create.

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The architecture looks as follows:

The logic of the Front Matter AI - API is open-sourced as well: https://github.com/FrontMatter/web-documentation-nextjs/blob/main/pages/api/ai-title.ts

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The setting got updated to a more generic value: frontMatter.sponsors.ai.enabled.