Library build

[fossilfriend]

• separate example app and react component library
• introduce rollup to package the component library
• proof of concept tailwindcss config & application to Text components
• proof of concept StoryBook of Text components
• basic Text components added to example app
• example app reconfigured to import niagads-viz-js from parent /dist directory
• restructured locuszoom adapters/layouts to pure .js (no longer TypeScript) b/c rollup-dts can't handle ambient types

TODO: figure out how to make highcharts an external dependency; it is being imported even on pages that don't use highcharts-derived components

NOTE: may have the same issue for locuszoom

Question for review: should 'dist' directory be committed? It can always be generated after cloning by running npm build