Remove additional babel packages and webpack configuration

[ricricucit]

This an alternative (and to my knowledge "cleaner") solution for inherited babel packages and configuration (see Transpilation PR on JS-SDK).

This way, an Aepp developer does not need to install any of the SDK required packages and configurations, in order to have the transpilation and treeshaking of the SDK modules.

The only needed config is at bundling level (Webpack), adding the SDK and the rlp libs to the default setup, usually excluding node_modules path:

exclude: /node_modules/, // default exclusion for many front-end projects
include: [/node_modules\/@aeternity/, /node_modules\/rlp/], // additional row to have transpilation and tree-shaking of SDK modules