Only build docs on cron and dev builds

.travis.yml

@@ -42,6 +42,7 @@ stages:
   - name: pip_package
     if: tag =~ ^v(\d+|\.)*[^a-z]\d*$
   - name: docs_dev
+    if: tag =~ ^v(\d+|\.)*[a-z]\d*$
   - name: docs_daily
     if: type = cron
 
@@ -138,8 +139,6 @@ jobs:
       <<: *default
       stage: docs_dev
       env: DESC="docs" CHANS_DEV="-c pyviz/label/dev" HV_DOC_HTML='true' HV_DOC_GALLERY='false' HV_REQUIREMENTS="doc"
-      services:
-        - xvfb
       script:
         - bokeh sampledata
         - nbsite generate-rst --org pyviz --project-name holoviews --offset 0 --skip ^reference
@@ -151,9 +150,7 @@ jobs:
         access_key_id: $AWS_ACCESS_KEY_ID
         secret_access_key: $AWS_SECRET_ACCESS_KEY
         region: eu-west-1
-        bucket: "build.holoviews.org"
-        on:
-          all_branches: true
+        bucket: "dev.holoviews.org"
 
     - <<: *doc_build
       stage: docs_daily