v9.0.7-canary.4

Patches

• Update page sizes displayed on build: #8777
• Enable Experimental CSS Source Maps: #8805
• Add Working with Ghost and Next.js to Recipes: #8800
• Fix using withRouter in _app opting out of auto-export: #8811

Credits

Huge thanks to @janicklas-ralph, @Timer, and @daviddarnes for helping!