*: website_blog, website_event
This commit adds a "Height" option to sections, allowing them to have a
minimum height of the user's choosing (either full screen height or half
screen height, similar to blog covers). Enabling the full screen option
also allows the user to add a "scroll down button" that will scroll down
to the next section, also similar to blog covers.
As such, the classes doing the corresponding things in website_blog and
website_event have been renamed to reuse the same code.
task-2155710
closesodoo/odoo#41623
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>