[MERGE][REF] website_slides: revamp channel form view and inline slide categories

PURPOSE

This PR completely reworks the slide.channel form view. Notably slide categories
management should be simplified like SO or invoices sections.

SPECIFICATIONS

This merge

* improves the content management from the form itself by adding a tree view
of slides with the possibility of drag and dropping slides from category to
category;
* adds buttons to quickly add content or certifications in the slide tree
views;
* reorders the tabs and fields on channel view and update some labels;
* adds a custom float field widget so that the ratings are actually displayed
as stars;
* contains some fixes and light improvements related to recent merges in
elearning application, especially backend;

In order to implement the content management in the channel form, the model
slide.category has been removed. Instead of having a fully fledged model for
the categories we now use slide.slide with a is_category flag.

LINKS

Task 1978731
PR #33255

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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