chore(release): 1.4.0 [skip ci]

# [1.4.0](v1.3.5...v1.4.0) (2023-06-21)

### Bug Fixes

* **charts:** set duration charts label to HHhMM for listening time analytics ([3fc1d8e1](3fc1d8e1))
* **embed:** set height of player iframe from config ([46657414](46657414))
* **s3:** serve files without cache if dummy cache handler + add http referer header to redirect ([30db9f06](30db9f06))
* **s3:** use presigned request uri to serve static files ([cb92dc73](cb92dc73))
* **webmanifest:** import misc helper to get site_icon_url ([548a11d5](548a11d5))

### Features

* **import:** run podcast imports' processes asynchronously using tasks ([d8e1d403](d8e1d403))
* **rest-api:** add endpoints for episodes and full text search for podcasts and episodes ([85505d4b](85505d4b)), closes [#296](#296)