Add installation & updater scripts

[tarto-dev]

We need to add 2 files,

• Installation should be a single file, like setup.sh which will create the whole required files, make some copies of previous files (in order to perform backups or rollback the installation)

• update.sh should be able to perform a new fresh install, we should differenciate "stock" functions and let user add it's own aliases (maybe create a custom.bashrc in order to store this)

• Maybe a delete.sh file could be usefull in order to proper remove the whole bunch of iles (open to discussion)

[tarto-dev]

@benftwc todo: prioriser cette tache