Add redirect/proxy named param on routeRules

[maximepvrt]

Describe the feature

routeRules: {
    '/card/:contributor.png': { proxy: '/__og-image__/image/:contributor/og.png' },
    '/:contributor/__og_image__/og.png': { redirect: '/card/:contributor.png' },
  }

Additional information

• Would you be willing to help implement this feature?

[maximepvrt]

@pi0 ;-)