Task #1940360
Subtask of #1902304

Purpose
=======

Adds certification capabilities to the website_slides module.
Channel/courses can now include certifications as a new type of slide.

This new type of slide is available as a "Certification" button on the slide creation
frontend view (next to "Video", "Presentation", ...).
Users have to link the slide to an actual survey that has the 'certificate' field
set to true (that will populate the slide's survey_id field).

Slides of type certification are handled in frontend in a very simple way for now:
- A button "Begin certification" that redirects the user to the related survey frontend.
- A button "Download certification" when the user has succeeded the certification.
  (A new download route has been added in the survey module to make it work.)
- When the survey is done, if it's linked to a slide, a button "Go back to course" allows
  the user to go back to the slide frontend.

(There is a special use case for when the website_publisher designing the survey lands on a
certification slide: he is allowed to test the survey with a survey_input created as test_entry)

Survey creation as well as limited time, limited number of attempts, ... are still completely
handled in the survey module. That means that the user will have to first create a suitable survey
that is a certification and only then create a slide of type "certification" and link
the created survey to it.

Ideally, the taking of the survey should be transparently included in the slide frontend but
it requires a full refactoring of the way surveys are submitted. This will most likely come in
a later commit.

This commit is an advanced merge of full eLearning module (see task #1902304).

This merge proposes a new homepage for slides module evolving towards
an eLearning platform. This merge closes task 1936153 and PR #30770.
More generally this merge is linked to currently under heavy work slides
module update to eLearning [1][2].

It includes

 * a new main page displaying top courses / channels. It displays 3 most
   popular and newest channels as well as its ongoing courses (if logged).
   Achievements and karma update done by eLearning community allow to
   give a gamification look and feel;
 * an 'All' page displaying all courses / channels. Tag groups and tags
   allow to search / filter displayed courses;
 * a new pimped and revamped display for main course / channel page;
 * new demo data for slides and small addition of demo data in bridge module
   with website_sale and website_forum;

Some features may not be completely working as other tasks will continue to
improve the display, notably new slide display [1], some forum / slide
link improvements [3] and certification integration [4]. Some code cleaning
will come in future update as this merge allows to unblock those other tasks.

For more details see sub commits. And thanks to the RD Fun SM Team. Much
fun, much SM.

[1] main eLearning task: task ID 1902304 - PR #29876
[2] new user profile /gamification: task ID 1922159 - PR #30514
[3] forum and comments upgrade: task ID 1940516 - PR #30514 and #31097
[4] certification inside eLearning: task ID 1940360 - PR #31060

Purpose
=======

Consultancy companies need resumé and skills of their consultants.
For big projects, they often need to send them to their customers.
These informations are also useful to statistics.

Specification
=============

1. Resumé
Being able to add resumé lines of multiple types (Experience, Eduction, Hobby, etc)
Resumé lines are displayed, grouped by type, in a new 'Resumé' tab in the employee
form.
Each resumé line has a title, an optional description, a start date and an optional end date.
Each employee should be able to edit its own resumé. An hr_user is also allowed to edit resumés.
Resumé lines can be reordered (handle widget)

2. Skills
Allow to add different skills. Each skill is associated with a type (Languages, marketing, dev, ...)
Employees can have a level for each skill. Skill levels can be added by skill,
They have a name and a progress (from 0 to 100).

Employee skills are displayed in the Resumé tab, grouped by skill type.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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