fixed and cleaned documentation links

[rsora]

Fixes documentation links as per #3 :

• removed in README.adoc
• Updated to repo link in library.properties file

[q2dg]

But this "solution" simply consists in removing the link to the (inexistent) reference. But reference itself doesn't exists yet!

[SimonePDA]

Dear @q2dg we have decided that libraries that are helpers or internal will not be documented on the standard reference pages (this is why the link was removed) to keep the users focused on what matters and to avoid the dispersion of our resources. People interested in such internal information can find it inside the library files themselves as we still document the code with all the relevant information and that will be the reference for such kind of libraries. We have made this choice to allow us to produce the reference documentation online for the fast growing number of libraries that are needed to use the new boards and shields. If you need information on a library as this one, you are capable of getting it from the comments in the code. Thank you for your understanding

Simone

[bvernham]

When is the code going to be documented?