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/README.md

@@ -0,0 +1,18 @@
+# std-lib candidate is deprecated
+
+Going forward, `std-rfc` will be included in the main Nushell release,
+just like `std` is.  This will allow users to more easily try-out its potential
+new commands and features.
+
+Please contribute new `std` proposals to the main Nushell repository.
+
+See that [README](https://github.com/nushell/nushell/blob/main/crates/nu-std/std-rfc/README.md)
+for more information on how to contribute.
+
+## Removal
+
+This directory will be preserved for some period during deprecation, but no new
+contributions are expected to be accepted. Any remaining items from
+the older (pre-December 2024) `stdlib-candidate-old` should be identified for transition
+to `std-rfc`, since at some point we expect to delete this directory.
+

stdlib-candidate/README.md

@@ -1,40 +0,0 @@
-# std-lib candidate
-
-## Overview and Requirements
-
-This module includes potential candidate commands (and other definitions) for inclusion in the Standard Library (`std`) that is built in to Nushell. As a general guideline, candidates should:
-
-* Be general purpose
-* Have broad appeal to other users
-* Include doc comments for definitions and parameters that can be used with `help <command>`
-* Include tests
-
-The last two (doc and tests) do not need to be in place at the time of the initial inclusion in `stdlib-candidate`, but are, of course, required in order to promote to `std`.
-
-## Showcase and Discussion
-
-While primary feedback should take place in the PR, we have also established a [Drawing Board Discord Showcase](https://discord.gg/C3eMKV58MQ) which can be used for several purposes:
-
-* Ideation before a PR is submitted
-* Raise awareness of the PR
-* Short-term questions and discussion
-
-Note: The Drawing Board is not just for stdlib-candidate. Please tag your topic with `std-library` if it is about a Standard Library idea.
-
-## Promotion Evaluation
-
-In general, PRs will be evaluated after they have been trialed for a sufficient period, expected to be around 2 months. After that period, the feature may be:
-
-* Promoted to `std`
-* Removed from `stdlib-candidate`
-* Or changes may be requested and then reevaluated later
-
-## NUPM Note
-
-When submitting a PR, please bump the module's `nupm.nuon`.
-
-# Previous Repo
-
-Note: As of December 2024, the candidate module has been "reset" to start fresh. The previous version has been moved to https://github.com/nushell/nu_scripts/tree/main/stdlib-candidate-old
-
-