Create Documentation for "Can I Migrate My Paper App To Fabric?"

[chiaramooney]

Suggestion

As we move toward Fabric as the default, more developers will be wondering if Fabric is now ready for them to migrate their Paper RNW app to Fabric. While Fabric has reached over 80% parity, it has not reached full parity and there are many popular community modules that we don't yet support. We should create detailed documentation (on the website) explaining to developers what is/isn't supported on Fabric (this can include links to GitHub queries) and a list of modules supported/no supported on Fabric (can be a reactnative.directory query).

The page should also encourage developers to file issues for props/modules they need support for that we aren't currently tracking.

We've contemplated proposed a script which could search through an app's dependencies/source to determine if an app can move to Fabric yet. It's unclear if this is technically possible. Idea would require some technical investigation.

We want our documentation to be as clear as possible. We want to avoid developers trying to upgrade to Fabric, hitting unexpected errors/blocks, and then repeating this process on loop for each React Native Windows version that's released.

Location

Advanced Topics (Windows), with callout to the page in Getting Started/Upgrading

[chrisglein]

Suggestion: We can expand this existing page, which many of the tools are linking to: https://microsoft.github.io/react-native-windows/docs/new-architecture

So essentially add a section on how to upgrade, concerns when upgrading. Refactor the page to highlight the right things bubble to the top.