Añado gestion de login y logout de usuarios, terminadas páginas de inicio de sesión y Acerca de. Creo barra de usuario iniciado
Voy a empezar con el arranque de máquinas para estudiantes
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	modified:   web/CygnusCloud/languages/default.py
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	modified:   web/CygnusCloud/models/db.py
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	modified:   web/CygnusCloud/models/menu.py
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