Fix Quarto workflow render paths

Author: Copilot

.github/workflows/preview.yml

@@ -14,9 +14,6 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
-    defaults:
-      run:
-        working-directory: ./.github/workflows
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6

.github/workflows/publish.yaml

@@ -8,9 +8,6 @@ jobs:
   rebuild-slides:
     name: rebuild-slides
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ./.github/workflows
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}