[FIX] website_slides: correctly set sequence of newly added content

Purpose of this commit is to add new content at last position in frontend.
Indeed backend uses last position in embedded list view, frontend should
do the same. Moreover when having a lot of content, having everything at
the bottom of the screen at the same position of Add content / section
buttons makes sens.

Specifications

  * when adding a new category: add it as last category;
  * when adding a new slide in a category: add it as last slide of the
    category;

Specific case of slide without category

  * when adding a new slide without category: add it as last slide of the
    channel (display it as last) but keep it on top in backend view
    (display as first);

Improve content list display in frontend of eLearning

  * contents without section are now at the bottom;
  * fixed alignment of buttons icon (Add Content and Add Section)
  * fixed broken design because of title too long

Task 2049640 (website slides back2basics and fiximp)
Task 2061672 (new content bug report)

Co-Authored-By: Michaël Mattiello <mcm@odoo.com>
Co-Authored-By: Alexis Lacroix <laa@odoo.com>

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