Css import and type issues in 0.30 beta

[czeidler]

Some things I noticed when trying the 0.30 beta:

1. When building an app with vite the css import doesn't work:

import 'react-calendar-timeline/lib/Timeline.css'

it needs to be changed to:

import 'react-calendar-timeline/dist/style.css';

2. The defaultTimeStart and defaultTimeEnd props are hardcoded to number which gives a type error when using Moment as a date type. (I tried to use unix timestamps but this broke the timeline, so there might be another bug)

[jantoine1]

Thanks, the CSS fix worked for me as well!