Bug: solve astro import in Datami project

Problem observed

After merged !18 (merged) about adding structured documentation, a bug occured in Datami-PRO :

You can reproduce the bug by launching Datami-PRO with task serve

Propositions of steps to do

To solve that bug, a solution could be to isolate astro documentation project from the datami-pro nuxt project by moving each one in two new independents directories : doc and app

Definition of DONE

• The application Datami-Pro works normally without error message
• The documentation runs normally on gitlab pages
• The documentation could be run locally