website: Use Docusaurus Frontmatter for badges (#12893)

website/docs: Reduce redundant usage of badges. Move badge logic to components.

- Fix JSX class name warning.
- Remove duplicate titles.
- Flesh out `support_level` frontmatter.

website/docs/add-secure-apps/providers/entra/add-entra-provider.md

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 title: Add an Entra ID provider
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-<span class="badge badge--primary">Enterprise</span>
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+authentik_enterprise: true
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 For more information about using an Entra ID provider, see the [Overview](./index.md) documentation.

website/docs/add-secure-apps/providers/entra/index.md

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 title: Microsoft Entra ID provider
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-<span class="badge badge--primary">Enterprise</span>
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+authentik_enterprise: true
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 With the Microsoft Entra ID provider, authentik serves as the single source of truth for all users and groups. Configuring Entra ID as a provider allows for auto-discovery of user and group accounts, on-going synchronization of user data such as email address, name, and status, and integrated data mapping of field names and values.

website/docs/add-secure-apps/providers/entra/setup-entra.md

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 title: Configure Entra ID
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-<span class="badge badge--primary">Enterprise</span>
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+authentik_enterprise: true
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 The configuration of your Microsoft Entra ID environment must be completed before you [add the new provider](./add-entra-provider.md) in authentik.