remove old, unused 'vars' vocab

extra/vars/authors.txt

@@ -1 +0,0 @@
-Eduardo Cavazos

extra/vars/summary.txt

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-Shorthand notation for variables

extra/vars/tags.txt

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-extensions

extra/vars/vars.factor

@@ -1,31 +0,0 @@
-! Copyright (C) 2005, 2006 Eduardo Cavazos
-
-! Thanks to Mackenzie Straight for the idea
-
-USING: accessors kernel parser lexer words words.symbol
-namespaces sequences quotations ;
-
-IN: vars
-
-: define-var-getter ( word -- )
-    [ name>> ">" append create-in ] [ [ get ] curry ] bi
-    (( -- value )) define-declared ;
-
-: define-var-setter ( word -- )
-    [ name>> ">" prepend create-in ] [ [ set ] curry ] bi
-    (( value -- )) define-declared ;
-
-: define-var ( str -- )
-    create-in
-    [ define-symbol ]
-    [ define-var-getter ]
-    [ define-var-setter ] tri ;
-
-SYNTAX: VAR: ! var
-    scan define-var ;
-
-: define-vars ( seq -- )
-    [ define-var ] each ;
-
-SYNTAX: VARS: ! vars ...
-    ";" [ define-var ] each-token ;