getInitialProps() to getServerSideProps() migration guide needed

[roxeteer]

Until recently, getInitialProps() was the way to load data for pages. Now it's not mentioned in the documentation at all anymore, and has been replaced with instructions on using getServerSideProps() on the server and SWR on the client.

However, it's not just a drop-in replacement. It would be very useful to have a migration guide for applications that have been built on getInitialProps().

The biggest issue for us is that our Redux implementation works with getInitialProps() but not with getServerSideProps(), but that might be out of the scope of a generic Next.js migration guide.