Include images locally from revealjs-poul.

day_1.md

 # Corsi Python 2017
 
-Niccolò Izzo
+![POuL logo](lib/img/logo-text-white.svg)
 
-**izzo.niccolo chiocciola gmail.com**
+- Niccolò Izzo
+  `<izzo.niccolo_chiocciola_gmail.com>`
+- Tancredi Orlando
+  `<tancredi_chiocciola_coselosche.org>`
 
-Tancredi Orlando 
-
-**tancredi chiocciola coselosche.org**
-
-![POuL](https://www.poul.org/wp-content/themes/hipoul/img/newlogo.svg)
 
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