[field] Remove incorrect readme

packages/@sanity/field/README.md

@@ -1,30 +0,0 @@
-# @sanity/diff: Tools for diffing data structures
-
-`@sanity/diff` is a library for calculating and presenting _diffs_ of content.
-
-## Concepts and architecture
-
-- The main data structure is `Diff` which represents a difference between two versions. This is a
-  nested data structure so if it's an `ObjectDiff`, then its children will have `Diff` as well.
-
-  The `Diff` is built on top of the _unchanged_, _added_ and _removed_ primitives. This means that
-  it will contain both versions at the same time and it's always trivial to recreate the old/new
-  version (by ignoring the added/removed parts of the diff).
-
-  Note that for arrays and objects, unchanged/added/removed only have a "shallow" meaning. An
-  `ObjectDiff` will have a *unchanged field* if the field was present in both the old and new
-  version - regardless of whether there's any internal changes.
-
-- `Diff` also supports _annotations_. These contain information about when a change was introduced
-  and who was responsible for it.
-
-- To construct a `Diff` you need to represent the versions as `Input` types and use `diffInput(from,to)`
-  to create the diff. The primary reason for a separate `Input` type is to support passing along
-  annotations. In addition, this allows us to optimize based on the object equality of the inputs.
-
-- There are multiple ways of _presenting_ a diff: Sometimes you want to only show the fields that
-  has changed, and other times you want to show the full new (or old!) document interspersed with the
-  changes.
-
-  This library does _not_ contain any UI components, but instead provides various
-  presentation-related helper functions.