Release v2.15.3

What's Changed

• Add highlight teacher functionnality for IUT Vannes by @DamienML in #119
• Reduce Docker image size + clean dependencies usage (first version of PlanningSup was 1.33Gb, now 222Mb !)

New Contributors

• @DamienML made their first contribution in #119

Full Changelog: v2.15.2...v2.15.3