chore(webpack): improvements of build artifacts

[hopkins-tk]

Build of the whole project will now produce:

• icons-... asset
• index.html
• index.min.js
• index-with-dependencies.min.js
• styles.min.js

[Hotell]

Things to do

( Im putting it here because stupid github has hidden those comments )

this build entry points are not doing what you think they are doing.

index.ts imports define from skate, so as a end result. skate will be always bundled. This is not what we wanted.

What you need to do:

• [ ] for prod build you have to provide externals for main index.ts packages

  externals: {
  skatejs: 'skatejs'
  }

• [ ] for prod build of index-with-deps.ts that vendor import is completely unnecessary and may increase bundle size. We are using three shaking, so only used functions/imports are bundled. only thing that you need to import there are polyfills

this will be addressed in another PR https://github.com/wc-catalogue/blaze-elements/issues/177

[Hotell]

Great job @hopkins-tk will take a look tomorrow. If everything will be OK, I'll merge it. Thx!