Update README.md
[Page Management] Logic implemented, working properly and tested.
Merge commit '4bbc8192dea06e97a7bdd3a27c56a791e12070a6' into Design

Conflicts:
	src/java/cat/urv/deim/sob/exceptions/SOBError.java
	web/header.html
	web/index.jsp
Merge origin/Design into Design

Conflicts:
	web/index.jsp