Update upstream

[FabianWilkens]

Problem

• Upstream source changed
• Git submodules not needed anymore
• ci-auto-update is not working anymore

Solution

• Update upstream code in manifest.json
• Modified scripts from git clone to ynh_setup_source
• Tinified doc/screenshots
• Update ci-auto-update
• Modify auto-update from daily to weekly
• Update to latest version of ynh_install_ruby__2
• Fix conf/ and scripts/ to new upstream source

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)

[FabianWilkens]

!testme

[yunohost-bot]

Fingers crossed!