basic react component implementatino is sep project #59

Changes

add workspaces with react -- not really used correctly, but does the work
React project in react folder
- webpack project with umd target
- move all core
change for copy in webpack.prod.conf.js works: only index.js and index.d.ts
build script
- try to build react project first, then the root
- ... also remove dev build from prod build
don't exclude "exclude": ["*.tsx"] in tsconfig -- not necessary

Replace in client core

import { ChartwerkLinePod } from '@chartwerk/line-pod/dist/react/ChartwerkLinePod';

to

import { ChartwerkLinePod } from '@chartwerk/line-pod/react';