[IMP] website, web: add fullscreen mode and frontend keyboard shortcuts

While the edit mode interface is full of useful things, it also adds a
lot of clutter, and alters the page's width and thus, its layout. This
commit adds keyboard shortcut for website editors to use, and allows
them to enter a "fullscreen" mode that hides the editor interface while
remaining in edit mode, allowing the user to have fewer distractions
while editing text content, and a closer rendition of the page's final
layout while editing.

For this, keyboard shortcuts were required, and a few other useful
shortcuts have been added, such as alt-1,2,3 for the navbar, just like
in the backed.

task-2126915

closes odoo/odoo#46953

Related: odoo/enterprise#9295
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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