simplify BaseInterfaces docs as README is now included

Author: rafaqz

docs/src/baseinterfaces.md

@@ -1,17 +1,5 @@
 # BaseInterfaces reference
 
-BaseInterfaces.jl is a work-in-progress package to define
-the major base julia interfaces in Interfaces.jl syntax.
-
-As many of these are not actually clarified yet, even in docstrings,
-this is a difficult task and can't be 100% reliable.
-
-But at least trying is worthwhile to get the ball rolling.
-
-If you would like this interface to be more useful, and actually 
-registered, please contribute tests to the interface specs and new 
-interface we have not yet defined.
-
 ## Index
 
 ```@index