Fix current non-git installs upgrade

[mr-eshua]

Problem

• Current upgrade procedure is very harsh on existing non-git installs and may leave them broken after all

Solution

• Instead of complete removal old friendica directory to replace with git clonned sources, there is an attempt to convert current install directory into a git repo and update it from stable branch. This was tested enough on existing 2021.01 install and went successfully.
• Also the upgrade script rewrites local friendica config for some reason and this may lead to loosing of some user-defined changes (like admin rights in our case) and it is not a good practice. Currently I commented out the ynh_add_config helper, but maybe we need to come up with a better approach to preserve the user changes and to add possible updated config parameters from a new friendica version altogether.

PR Status

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

[tio-trom]

This one fixed my Friendica!

[ericgaspar]

!testme

[yunohost-bot]

:carousel_horse:

[ericgaspar]

@mr-eshua Do you know why upgrade is failling? 🤔

[ericgaspar]

!testme

[yunohost-bot]

:v:

[tituspijean]

!testme

[yunohost-bot]

:stuck_out_tongue_winking_eye:

[ericgaspar]

!testme

[yunohost-bot]

:stuck_out_tongue_winking_eye:

[tituspijean]

!testme

[yunohost-bot]

:v:

[ericgaspar]

closing with #99