docs: update CodiMD compatibility notice to point to standalone codimd-cli

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Yukaii

README.md

@@ -13,11 +13,13 @@
 
 ## v2 notice
 
-`hackmd-cli` v2 now only supports the official HackMD instance([hackmd.io](https://hackmd.io)) and HackMD EE instances after version `1.38.1`. CodiMD is not supported anymore. If you want to use the CLI tools with CodiMD, please check out the [`v1.x` README](https://github.com/hackmdio/hackmd-cli/tree/v1.2.0) and follow the instruction there.
+`hackmd-cli` v2 now only supports the official HackMD instance ([hackmd.io](https://hackmd.io)) and HackMD EE instances after version `1.38.1`. CodiMD is not supported in this package.
+
+**CodiMD users:** A dedicated standalone CLI is now available at [hackmdio/codimd-cli](https://github.com/hackmdio/codimd-cli). Please refer to that repository for installation and usage instructions.
 
 ### Migrating from v1.x
 
-1. If you are using the CLI with CodiMD, please follow the [`v1.x` README](https://github.com/hackmdio/hackmd-cli/tree/v1.2.0)
+1. If you are using the CLI with CodiMD, please use the standalone [codimd-cli](https://github.com/hackmdio/codimd-cli) instead.
 2. If you are using the CLI with HackMD([hackmd.io](https://hackmd.io)) or HackMD EE(Enterprise Edition) instances:
     * **You're using the JSON file-based config**: Remove `~/.hackmd/config.json` and start over again. You can start with [configuration](#configuration) section.
     * **You're using environment variable based config**: `HMD_CLI_SERVER_URL` has been replaced with `HMD_API_ENDPOINT_URL`. And `HMD_API_ENDPOINT_URL` may vary depending on your instance. Please check contact your instance admin to get the correct `HMD_API_ENDPOINT_URL`. For generating access token, please check the [configuration](#configuration) section. You'll need to set the `HMD_API_ACCESS_TOKEN` environment variable.