Remove bare RAKUDO_LINE_EDITOR

It ended up being removed in favour of a better solution in:
Raku/nqp@5bec212105

Author: zoffixznet

doc/Programs/00-running.pod6

@@ -135,14 +135,10 @@ Please do not set them manually.
 =head2 REPL
 
 =defn C<RAKUDO_LINE_EDITOR> (C<src/core/REPL.pm>)
-Specifies what line editor to use. Valid values are C<Linenoise>, C<Readline>, C<none>, and C<bare>,
+Specifies what line editor to use. Valid values are C<Linenoise>, C<Readline>, and C<none>,
 which load L<Linenoise|https://modules.perl6.org/repo/Linenoise> or
 L<Readline|https://modules.perl6.org/repo/Readline> line editors, or starts the
-default (C<none>) line editor that doesn't require any extra modules. The special value C<bare>
-enables non-interactive REPL that merely evals all of the code given to it on STDIN and then exits.
-If C<RAKUDO_LINE_EDITOR> is set to values other than C<bare> and C<perl6> executable is
-run on a non-TTY display, it will use the specified line editor, instead of automatically
-using the C<bare> editor.
+default (C<none>) line editor that doesn't require any extra modules.
 
 =head2 Other