Deprecate the nu_scripts version of stdlib-candidate (#1042)

Deprecates the existing `stdlib-candidate` directories in `nu_scripts`
since `std-rfc` has now transitioned to the main repo. Updates readme
and renamed directories.

stdlib-candidate-archive/std-rfc/conversions/name-values.nu

@@ -0,0 +1,14 @@
+# Assign keynames to a list of values, effectively converting the list to a record.
+#
+# Example:
+#
+# [ 1 2 3 ] | name-values a b c
+# => ╭───┬───╮
+# => │ a │ 1 │
+# => │ b │ 2 │
+# => │ c │ 3 │
+# => ╰───┴───╯
+export def main [...names: string]: [list -> record] {
+    let IN = $in
+    0.. | zip $IN | into record | rename ...$names
+}