remove duplicate github deploy.yml; only forgejo build.yaml runs now

Forgejo Actions executes both .github/workflows/ and .forgejo/workflows/.
deploy.yml was a duplicate of .forgejo/workflows/build.yaml that used
docker/build-push-action@v5, which produces OCI image-index manifests
that argocd-image-updater cannot read. Removing it leaves only the
classic-docker-build workflow.

elixir.yaml, claude.yml, claude-code-review.yml, dependency-updates.yml
are kept (no forgejo equivalents).

.github/workflows/deploy.yml

@@ -1,57 +0,0 @@
-name: Build and Deploy
-
-on:
-  push:
-    branches: [main]
-
-# Cancel any in-progress run when a new one is triggered
-concurrency:
-  group: deploy-${{ github.ref }}
-  cancel-in-progress: true
-
-env:
-  REGISTRY: git.mcintire.me
-  IMAGE: git.mcintire.me/graham/aprs.me
-
-jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    outputs:
-      image_tag: ${{ steps.tag.outputs.image_tag }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-
-      - name: Compute image tag
-        id: tag
-        run: |
-          TIMESTAMP=$(date +%s)
-          SHA=${GITHUB_SHA:0:7}
-          echo "image_tag=main-${TIMESTAMP}-${SHA}" >> "$GITHUB_OUTPUT"
-
-      - name: Log in to registry
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: true
-          tags: |
-            ${{ env.IMAGE }}:${{ steps.tag.outputs.image_tag }}
-            ${{ env.IMAGE }}:main
-          cache-from: type=registry,ref=${{ env.IMAGE }}:main
-          cache-to: type=inline