Update recipes to work with blitz toolkit

[dillondotzip]

What is the problem?

Some recipes are out of date and need to be updated.

• [ ] recipes/secureheaders
• [ ] recipes/theme-ui
• [ ] recipes/vanilla-extract

The main thing that that needs to be updated is the use of paths.blitzConfig(). Blitz toolkit exports helpers for transforming next.config.js.

You can get the next.config.js path with paths.nextConfig(). transformNextConfig is exported from blitz and returns the following:

program: Program
configObj: []
pushToConfig: (property: j.ObjectProperty) => void
wrapConfig: (func: string | j.CallExpression) => {
   withBlitz: j.Identifier | j.CallExpression 
}
addRequireStatement: (identifier: string, packageName: string) => void

(wrapConfig().withBlitz returns whatever is inside withBlitz())

[siddhsuresh]

Hey @dillonraphael can I work on this?