Soundbites are a mean to tease the episode, putting them in the episode page is unnecessary.

- replace $is_published attribute by $publication_status to better handle episode's publication
state
- update publication date datepicker to include a clear button

fixes #70

# [1.0.0-alpha.29](https://code.podlibre.org/podlibre/castopod/compare/v1.0.0-alpha.28...v1.0.0-alpha.29) (2020-12-10)

### Bug Fixes

* **episodes:** add publication status + set publication date to null when none has been set ([d882981b](https://code.podlibre.org/podlibre/castopod/commit/d882981b3a86c81921ce6b07d4cf61fc13983689)), closes [#70](https://code.podlibre.org/podlibre/castopod/issues/70)

### Reverts

* **soundbites:** remove soundbite table from episode's public page ([5dc0f196](https://code.podlibre.org/podlibre/castopod/commit/5dc0f19656de0d764f627d6ae78a9e306c901835))