ci: tweak docs preview url and deploy folder

Author: robtaylor

.github/workflows/deploy-docs.yml

@@ -24,7 +24,7 @@ jobs:
 
       - uses: JamesIves/github-pages-deploy-action@v4
         with:
-          folder: .
+          folder: docs/_build
           branch: gh-pages
           clean-exclude: pr-preview
           force: false

.github/workflows/preview-docs.yml

@@ -13,8 +13,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Set base URL for preview if PR
-        run: echo "DOCS_BASE_URL=https://${{ env.DOMAIN }}/${{ env.PR_PATH}}/" >> $GITHUB_ENV
 
       - name: Setup PDM
         uses: pdm-project/setup-pdm@v4
@@ -31,7 +29,8 @@ jobs:
 
       - uses: rossjrw/pr-preview-action@v1
         with:
-          source-dir: .
+          source-dir: docs/_build
           preview-branch: gh-pages
           umbrella-dir: pr-preview
           action: auto
+          pages-base-url: chipflow-lib.docs.chipflow-infra.com