docs: replace README with archive notice pointing to kintone/openapi-spec

README.md

@@ -1,56 +1,26 @@
 # kintone/rest-api-spec
 
-[![CI](https://github.com/kintone/rest-api-spec/actions/workflows/ci.yaml/badge.svg)](https://github.com/kintone/rest-api-spec/actions/workflows/ci.yaml)
+> [!IMPORTANT]
+> This repository is no longer maintained and is being archived.
+>
+> The [OpenAPI](https://www.openapis.org/) Description for the kintone REST API now lives in
+> **[kintone/openapi-spec](https://github.com/kintone/openapi-spec)**. The files kept here are frozen
+> and no longer describe the current API.
 
-[OpenAPI](https://www.openapis.org/) Description for the kintone REST API.
+## Where to find the OpenAPI Description
 
-> [!WARNING]
-> Experimental: This repository is still under early development.
+- Repository: [kintone/openapi-spec](https://github.com/kintone/openapi-spec)
+- Bundled description, YAML: <https://raw.githubusercontent.com/kintone/openapi-spec/main/openapi.yaml>
+- Bundled description, JSON: <https://raw.githubusercontent.com/kintone/openapi-spec/main/openapi.json>
 
-- [Concept](#concept)
-- [Usage](#usage)
-  - [OpenAPI Description (OAD)](#openapi-description-oad)
-  - [Website](#website)
-- [Releases](#releases)
-- [Limitations](#limitations)
-- [License](#license)
+The interactive website that this repository publishes is being taken down. To browse the API, read
+the [kintone REST API reference](https://kintone.dev/en/docs/kintone/rest-api/).
 
-## Concept
+## Feedback
 
-This repository provides the [OpenAPI](https://www.openapis.org/) Description (OAD) for the [kintone REST API](https://kintone.dev/en/docs/kintone/rest-api/).
-
-OpenAPI is a specification for describing REST API interfaces. It is both human- and machine-readable.
-
-It is widely supported by API-related tools and services, enabling tasks such as inspecting REST API responses using Postman or automatically generating REST API clients.
-
-## Usage
-
-The specification for the kintone REST API is available in two formats: OAD files (for tools) and an interactive website (for humans).
-
-### OpenAPI Description (OAD)
-
-OAD files are located in the `kintone/${timestamp}` directory, where `${timestamp}` represents the publication date and time.
-
-| File | Description                                                                                               |
-|---|-----------------------------------------------------------------------------------------------------------|
-|`kintone/${timestamp}/openapi.yaml`| A multi-file version of the API description using the `$ref` keyword.                                        |
-|`kintone/${timestamp}/bundled/openapi.yaml`| A bundled, single-file version of the API description for tools that do not support the `$ref` keyword. |
-
-### Website
-
-We host an interactive website that provides the API specification at:
-**https://kintone.github.io/rest-api-spec/**
-
-You can browse the list of kintone REST APIs, view their request and response formats, and try out API calls by setting an authorization header.
-
-## Releases
-
-- The version for the following month will be released in the middle of each month.
-- Outdated versions may be removed periodically.
-
-## Limitations
-
-- The API interface is based on the kintone REST API in the [Current Channel](https://jp.cybozu.help/k/en/admin/new_feature/new_feature_overview.html#new_feature_new_feature_overview_10), with all [Update Options](https://jp.cybozu.help/k/en/admin/new_feature/new_feature_overview.html) checkboxes left unchecked.
+This repository no longer accepts issues or pull requests. For anything about the current
+specification, follow the
+[feedback guidance in kintone/openapi-spec](https://github.com/kintone/openapi-spec#feedback).
 
 ## License