Move all "skills" code inside main/skills

[jmontoyaa]

Current behavior / Resultado actual / Résultat actuel

Currently the skills code is in:

main/admin/
main/badge/

Expected behavior / Resultado esperado / Résultat attendu

Code should be inside:

main/skills

Steps to reproduce / Pasos para reproducir / Étapes pour reproduire

Copy and move code.

Chamilo Version / Versión de Chamilo / Version de Chamilo

1.11.x

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[christianbeeznest]

The request is done in this PR #4375 , it requires more testing.

Thanks for confirmation.