This commit has two main goals:
1. Adapt the copy of the `s_text_cover` snippet to fit each theme
2. Introduce custom images for each themes, as the `s_text_cover` was
always using the same image until now
This commit also fixes some conflicting classes due to a change of
`background-color` in the default snippet.
task-4119904
Part of task-3619705
Part-of: odoo/design-themes#919
Related: odoo/odoo#180736
Signed-off-by: Benjamin Vray (bvr) <bvr@odoo.com>
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Chrysanthe (chgo)