Purpose of this commit is to rewrite slides demo data. More channels, more
slides, more images, less Odoo oriented content.
Everything is still not completely clean but at least it begins to look like
something we could show to people. Thanks to @awa-odoo who gave some demo
data. No thanks to @xmo-odoo who did not give demo data about the emu war.
This commit is linked to task ID 1936153 and PR #30770.
Co-Authored-By: Aurélien Warnon <awa@odoo.com>
Co-Authored-By: Thibault Delavallee <tde@odoo.com>
