Remove Generics guide; update links to point to pursuit (#238)

Author: hdgarrood

README.md

@@ -29,7 +29,6 @@ This repository is a collaborative effort, so please feel free to make a pull re
 -[Common Operators](guides/Common-Operators.md)
 -[The Foreign Function Interface (FFI)](guides/FFI.md)
 -[FFI Tips](guides/FFI-Tips.md)
--[Generic Programming](guides/Generic.md)
 -[Custom Type Errors](guides/Custom-Type-Errors.md)
 -[PureScript Without Node](guides/PureScript-Without-Node.md)
 -[Contrib Library Guidelines](guides/Contrib-Guidelines.md)

errors/CannotDerive.md

@@ -10,10 +10,16 @@ derive instance showBool :: Show Bool
 
 ## Cause
 
-This error shows up when you're attempting to derive an instance for which compiler
-support does not exist.
+This error shows up when you're attempting to derive an instance for a class
+for which compiler support does not exist. There is a [fixed list of classes
+which can be derived by the compiler][derivable]; for any class not on this
+list, however, you'll need to find another way of obtaining an instance.
 
 ## Fix
 
 - You will need to write an instance yourself.
-- If you want to derive e.g. `Show` you can use [Generics](https://github.com/purescript/documentation/blob/master/guides/Generic.md#show-eq-ord).
+- For many classes (including `Show`), you can use [Generics][] to obtain the
+ instances you want with less effort.
+
+[Generics]: https://pursuit.purescript.org/packages/purescript-generics-rep
+[derivable]: https://github.com/purescript/documentation/blob/master/language/Type-Classes.md#type-class-deriving

guides/Generic.md

@@ -168,7 +168,7 @@ for a list of other type classes.
 
 Using generics, it is also possible to use generic implementations for type
 classes like `Bounded`, `Monoid`, and `Show`. See
-[here](https://github.com/purescript/documentation/blob/master/guides/Generic.md)
+[the generics-rep library](https://pursuit.purescript.org/packages/purescript-generics-rep)
 for a list of other type classes that have generic implementations, as well as
 an explanation of how to write generic implementations for your own type
 classes.