ci: remove release hook

.github/workflows/release.yml

@@ -1,11 +0,0 @@
-name: Release landed
-on:
-  release:
-    types: [published]
-jobs:
-  - name: Notify in Discord
-    env:
-      DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
-    uses: Ilshidur/action-discord@master
-    with:
-      args: '${{ github.event.tag_name }} is out 🚀 ${{ github.event.url }}\n${{ github.event.body }}'