trim production dependencies

[ricardobeat]

Neither of schema-dts or svelte are used at runtime, but they end up in the production node_modules due to how peerDependencies are handled by npm.

• schema-dts has typescript as a peerDependency
• svelte is declared as a peerDependency

Both get installed with npm install --production even thought they are unused, and when used to build an image for deployment this means they add ~67MB dead weight.