[nvim] highlight the `as` keyword/operator as a keyword

nvim/after/syntax/python.vim

@@ -1,4 +1,2 @@
-syn clear pythonOperator
-syn match pythonOperator '\V=\|-\|+\|*\|@\|/\|%\|&\||\|^\|~\|<\|>\|!='
 syn keyword pythonOperatorKeyword and in is not or
-syn cluster pythonExpression add=pythonOperatorKeyword
+hi def link pythonOperatorKeyword Keyword

nvim/after/syntax/rust.vim

@@ -0,0 +1,2 @@
+syn keyword rustOperatorKeyword as
+hi def link rustOperatorKeyword Keyword

nvim/colors/dotfiles.vim

@@ -351,10 +351,9 @@
 " }}}
 
 " Python {{{
-  hi! link pythonBuiltinType     Type
-  hi! link pythonBuiltinObj      pythonFunction
-  hi! link pythonClassVar        Variable
-  hi! link pythonOperatorKeyword Keyword
+  hi! link pythonBuiltinType Type
+  hi! link pythonBuiltinObj  pythonFunction
+  hi! link pythonClassVar    Variable
 " }}}
 
 " Ruby {{{