feat: allow subpath to be set (HOST_PATHNAME=/viewer)

chore: removed repeating code
feat: added dev banner
chore: removed unused css

chore: remove unused codes

WIP customise order of layout

rxjs: https://github.com/ReactiveX/rxjs/issues/3989
ngx-bootstrap:  `ngx-bootstrap/component-loader` no longer exported
webpack:  `optionsSchema.definitions.output.properties.path.description`
`TypeError: Cannot read property 'properties' of undefined`

fixes #91

feat: allow for bundledplugins

removed dependency on npm link, improved aot compilation asset bundling, added integrated plugin dev, changed readme

angular elements export complete. introduced animation. markdown converter now also uses inner content, added highlight to regions search by text, added bigbrain citation