fix password at user configuration

[OniriCorpe]

Problem

• since #36 the generated password is invisible to the final user
• related issue: #40

Solution

• show the password using POST_INSTALL.md so the user know it
• just in case, save the generated password in the app setting
• I also fixed some SC2086

PR Status

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

[yunohost-bot]

:sunflower:

[OniriCorpe]

poke @tituspijean maybe we should adapt your hooks from #36 by idk how they works ^^"

[SimonMellerin]

This will no longer be necessary when https://github.com/YunoHost-Apps/aeneria_ynh/pull/44 will be merged.

44 will fix ldap connection ;) (which was the original problem see https://github.com/YunoHost-Apps/aeneria_ynh/issues/40#issuecomment-1867797934)

[SimonMellerin]

44 is merged, I close this one