chore: drop Mintlify auto-deploy workflow

Avoiding a deploy-hook secret on a public repo. Mintlify rebuilds
will continue via the GitHub App's path-detection (with the existing
"chore: trigger Mintlify redeploy" workaround when needed).

.github/workflows/mintlify-deploy.yml

@@ -1,39 +0,0 @@
-name: Mintlify Deploy
-
-# Pings the Mintlify deploy hook on every push to main, unconditionally.
-#
-# Why: the Mintlify GitHub App detects docs changes by path-matching the
-# diff, and historically misses some legitimate docs commits — docs.mem0.ai
-# drifts out of sync and we have to push a no-op commit to force a redeploy
-# (see e.g. 843ab829 "chore: trigger Mintlify redeploy for #5152 docs").
-# Calling the hook on every push to main bypasses path detection entirely.
-#
-# Prerequisite: set repo secret MINTLIFY_DEPLOY_HOOK_URL to the value
-# generated in the Mintlify dashboard under Settings → Deploy Hooks.
-# If the secret is absent the workflow is a clean no-op (prints a warning
-# and exits 0) so this commit is safe to merge before the secret exists.
-
-on:
-  push:
-    branches: [main]
-  workflow_dispatch: {}
-
-permissions:
-  contents: read
-
-jobs:
-  trigger:
-    runs-on: ubuntu-24.04-arm
-    timeout-minutes: 2
-    steps:
-      - name: POST to Mintlify deploy hook
-        env:
-          HOOK: ${{ secrets.MINTLIFY_DEPLOY_HOOK_URL }}
-        run: |
-          if [ -z "$HOOK" ]; then
-            echo "::warning::MINTLIFY_DEPLOY_HOOK_URL is not configured; skipping deploy hook ping."
-            exit 0
-          fi
-          curl -sS --fail -X POST "$HOOK" -o /tmp/mintlify.out -w "HTTP %{http_code}\n"
-          echo "Deploy hook response:"
-          cat /tmp/mintlify.out