Revert CI profile from prerelease,prerelease-docs to prerelease-docs

Follow-up to #1932. Now that prerelease-subdomain is defined in
_quarto-prerelease-docs.yml rather than the phase profiles, the
profile group order correctly controls which phase is active on the
prerelease site. The explicit prerelease profile activation is no
longer needed and prevents RC branding from showing on
prerelease.quarto.org during RC phase.

Author: cderv

.github/workflows/preview.yml

@@ -103,7 +103,7 @@ jobs:
       - name: Render 
         uses: quarto-dev/quarto-actions/render@v2
         env:
-          QUARTO_PROFILE: ${{ steps.prerelease-docs-check.outputs.is_prerelease_docs == 'true' && 'prerelease,prerelease-docs' || '' }}
+          QUARTO_PROFILE: ${{ steps.prerelease-docs-check.outputs.is_prerelease_docs == 'true' && 'prerelease-docs' || '' }}
 
       - name: Deploy Preview to Netlify as preview
         id: netlify-deploy

.github/workflows/publish.yml

@@ -47,7 +47,7 @@ jobs:
       - name: Render 
         uses: quarto-dev/quarto-actions/render@v2
         env:
-          QUARTO_PROFILE: ${{ (inputs.prerelease || (contains(fromJSON('["push", "workflow_dispatch"]'), github.event_name) && github.ref == 'refs/heads/prerelease')) && 'prerelease,prerelease-docs' || '' }}
+          QUARTO_PROFILE: ${{ (inputs.prerelease || (contains(fromJSON('["push", "workflow_dispatch"]'), github.event_name) && github.ref == 'refs/heads/prerelease')) && 'prerelease-docs' || '' }}
 
       - name: Publish release website
         # Only do this step if