feat(vite-plugin-nitro): add support for Firebase App Hosting deployment

[brandonroberts]

PR Checklist

Closes #1528

What is the new behavior?

• Adds zero-config support for deploying fullstack Analog applications to Firebase App Hosting. No preset is necessary, as the default is node-server which is what Firebase App Hosting needs.
• Updates docs with Firebase App Hosting section.
• Adds note about Zerops as deployment partner.

Does this PR introduce a breaking change?

• Yes
• No

Other information

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