Improve accessibility wrt WCAG or RGAA

In the attached file below, there are recommandation to improve accessibility in Datafari:

Website_Accessibility_Inspection__https___demos.datafari.com_datafariui_home.xlsx

To use this file go in "Barriers" sheet tab. Each lines gives one recommandation.

The “Screencast” column shows where the correction is expected.

The "Detailed Dev Recommendation" column explains in an HTML page what is expected and how to make it, with a wealth of details. Copy/paste the cell's content to an HTML file to see it fully.

The "Specific Dev Recommendation" column explains expectations more closely related to our code.