remove description of language properties

this should be in the Nix manual

source/tutorials/nix-language.md

@@ -766,62 +766,4 @@ The `meta` attribute is itself an attribute set, where the `license` attribute h
 
 (This example is a (simplified) package declaration from `nixpkgs`.)
 
-# Nix language properties
-
-As a programming language, Nix is
-
-- *declarative*
-
-  It has no notion of executing sequential steps.
-  Dependencies between operations are established only through data.
-
-- *purely functional*
-
-  Pure means: Nix does not change the value of declarations during computation – there are no actual variables, only names for immutable values.
-
-  Functional means: In Nix, functions are like any other value.
-  Functions can be assigned to names, taken as arguments, or returned by functions.
-
-- *lazy*
-
-  It will only evaluate expressions when their result is needed.[^4]
-
-- *dynamically typed*
-
-  Type errors are only detected when expressions are actually evaluated.[^5]
-
-- *purpose-built*
-
-  The Nix language only exists for the Nix package manager.
-  It is not intended for general purpose use.
-
-[^4]: For example, the built-in function `throw` causes evaluation to stop. However, the following works, because `throw` is never evaluated:
-
-      ```nix
-      let lazy = { a = "success"; b = builtins.throw "error"; }; in lazy.a
-      ```
-
-          "success"
-
-[^5]: For example, while one cannot add integers to strings, the error is not detected by simply parsing the meaningless expression.
-
-      ```nix
-      let x = { a = 1 + "1"; b = 2; }; in x.b
-      ```
-
-          2
-
-      The error only detected on evaluation, that is, when trying to access the result.
-
-      ```nix
-      let x = { a = 1 + "1"; b = 2; }; in x.a
-      ```
-
-          error: cannot add a string to an integer
-
-                 at «string»:1:19:
-
-                      1| let x = { a = 1 + "1"; b = 2; }; in x.a
-                       |                   ^
-                      2|