Upgrade to v0.3.3 & add of instructions for administration to readmes

[OniriCorpe]

Problem

• there is a new version
• how to administrate is not clear

Solution

• upgrade to v0.3.3 #21
• add admin documentation to readmes d51f820fcbf30966458ecfec247606bc948fd48a

• 24

PR Status

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

[yunohost-bot]

[Bullseye :horse:] Meow :cat2:

[yunohost-bot]

:sunflower:

[yunohost-bot]

[Bullseye :horse:] :stuck_out_tongue_winking_eye:

[yunohost-bot]

:rocket: