Deprecate project and disable maintenance

- Add deprecation notice to README
- Remove scheduled execution from publish CI workflow
- Delete renovate configuration file

This project is no longer maintained.

Author: yoshiko-pg

.github/renovate.json5

@@ -10,8 +10,6 @@ on:
           - 'patch'
           - 'minor'
           - 'major'
-  schedule:
-    - cron: '0 0 20 * *' # at AM 9 JST on day of month 20
 
 concurrency:
   group: ${{ github.workflow }}

.github/workflows/publish.yml

@@ -1,5 +1,7 @@
 # stylelint-config-kwork
 
+> **⚠️ DEPRECATED**: This package is no longer maintained and will not receive any updates. Please consider using alternative stylelint configurations for your projects.
+
 Stylelint configs for KnowledgeWork's projects.
 
 ## Usage