Remove SPA and deploy-ui workflow: moved to lair/rpm.lair.cafe

The rpm.lair.cafe web UI now lives in its own repo (lair/rpm.lair.cafe)
since multiple package repos publish to the shared rpm repo; hosting the
shared UI inside one package repo no longer made sense.

.gitea/workflows/deploy-ui.yml

@@ -1,53 +0,0 @@
-name: deploy-ui
-
-on:
-  push:
-    branches: [main]
-    paths:
-      - "ui/**"
-      - ".gitea/workflows/deploy-ui.yml"
-  workflow_dispatch: {}
-
-jobs:
-  build-and-deploy:
-    runs-on: fedora-43
-    env:
-      RPM_REPO_HOST: oolon.kosherinata.internal
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: |
-          cd ui
-          npm ci
-
-      - name: Build UI
-        run: |
-          cd ui
-          npm run build
-
-      - name: Set up SSH
-        run: |
-          install --directory --mode 700 ~/.ssh
-          echo "${RSYNC_SSH_KEY}" | install --mode 600 /dev/stdin ~/.ssh/id_ed25519
-        env:
-          RSYNC_SSH_KEY: ${{ secrets.RSYNC_SSH_KEY }}
-
-      - name: Test SSH connectivity
-        run: |
-          ssh -o StrictHostKeyChecking=accept-new "gitea_ci@${RPM_REPO_HOST}" exit
-
-      - name: Deploy UI to web root
-        run: |
-          rsync \
-            --recursive \
-            --links \
-            --verbose \
-            --delete \
-            --chmod D755,F644 \
-            --include="index.html" \
-            --include="*.repo" \
-            --include="assets/***" \
-            --exclude="*" \
-            ui/dist/ \
-            "gitea_ci@${RPM_REPO_HOST}:/var/www/rpm/"