Static Generation / SSG Improvements

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Allow Next.js to become fully hybrid by providing methods to do both static generation and server-side rendering on a per-page basis.

Two new data per-page fetching methods
- getStaticProps – Opt-in to static generation (SSG) at next build time.
- getServerProps – Opt-in to server-side rendering (SSR) which renders on-demand.
A new method for statically generating (SSG) a set of routes from dynamic sources
getStaticPaths – Return list of parameters for dynamic routes to do static generation (SSG)