Remove unnecessary keep-alive (already in nanobot repo)

.github/workflows/keep-alive.yml

@@ -1,24 +0,0 @@
-name: Keep HF Spaces Alive
-
-on:
-  schedule:
-    - cron: '0 */12 * * *'
-  workflow_dispatch:
-
-jobs:
-  ping:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Ping nanobot
-        run: |
-          response=$(curl -s -H "Authorization: Bearer ${{ secrets.HF_TOKEN }}" \
-            "https://lenson78-nanobot.hf.space/health")
-          echo "nanobot: $response"
-          echo "$response" | grep -q "OK" && echo "nanobot OK" || echo "nanobot FAILED"
-
-      - name: Ping codex-proxy
-        run: |
-          response=$(curl -s -H "Authorization: Bearer ${{ secrets.HF_TOKEN }}" \
-            "https://lenson78-codex-proxy.hf.space/health")
-          echo "codex-proxy: $response"
-          echo "$response" | grep -q "ok" && echo "codex-proxy OK" || echo "codex-proxy FAILED"