Rework docs

[mskocik]

I can imagine better docs - more examples, more straightforward and clear.

• [ ] Rework the whole package to svelte-kit.
• [ ] Better examples:
  • [ ] basic data (simple array, object array, internal properties, groups)
  • [ ] selection (labelAsValue, valueAsObject, readSelection)
  • [ ] single/multi (max, collapseSelection)
  • [ ] custom rendering (renderer, custom item)
  • [ ] creatable (creatablePreffix, allowEditing, keepCreated, delimiter, createFunction)
  • [ ] UX (searchable, clearable, disabled, selectOnTab, virtualList, disableHighlight, lazyDropdown)
  • [ ] fetch (init, minQuery, fetchResetOnBlur, fetchMode, disableSifter)
  • [ ] dndzone
  • [ ] validation (#121)
• [ ] Find your use case questionnaire