Add Systemd remove supervisor

[ericgaspar]

Problem

• Description of why you made this PR

Solution

• And how do you fix that problem

PR Status

• [ ] Code finished and ready to be reviewed/tested
• [ ] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[ericgaspar]

!testme

[yunohost-bot]

:sunflower:

[yunohost-bot]

:books:

[lapineige]

!testme

[yunohost-bot]

:carousel_horse:

[yunohost-bot]

:books:

[lapineige]

I don't really get the changes, why removing supervisor ? Is it deprecated ?

The resulting configuration seems simpler at least. Sounds cool :)

[ericgaspar]

warning for using supervisor instead of systemd will popup soon on the CI resulting on level 6

[lapineige]

!testme

[yunohost-bot]

Meow :cat2:

[yunohost-bot]

:books: :bug: