feat(deemix): Add deemix (#1933)

* First commit

* add values.yaml

* Remove autogen files.
Update for service.
Add icon.

* Update app-requests.md

fix bad change

* Fix source

* Fix questions.yaml ordering.

* Further questions fix

* Address comments

* Update charts/incubator/deemix/values.yaml

Co-authored-by: Matt Haddock <matthewha@graphcore.ai>
Co-authored-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

docs/apps/app-requests.md

@@ -16,7 +16,6 @@ _This list is to track `App Requests` from one place._
 - [ ] Flexget #726
 - [ ] Seafile #725
 - [ ] dnsmasq #711
-- [ ] Deemix #628
 - [ ] Trackarr #602
 - [ ] Locast2Plex #473
 - [ ] InfluxDB #5
@@ -518,3 +517,4 @@ _These Apps have specific requirements or need specific customisation and care_
 - [x] Photoview #293
 - [x] Librephotos #293
 - [x] AMD - Automated Music Downloader
+- [x] Deemix #628