Replace pillar-web with blender-cloud, and add HTTPS support

Other vhosts are already configured to use the 'blender-cloud' hostname,
and now the main one is too. It also adds HTTPS support, so that you can
test locally without having to set FORCE_SSL to false. This does require
you to create a TLS certificate in /data/certs/blender-cloud.pem, using:

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes
cat key.pem cert.pem > blender-cloud.pem
rm key.pem cert.pem

docker/docker-compose.yml

@@ -24,7 +24,7 @@ blender_cloud:
   container_name: blender_cloud
   restart: always
   environment:
-   VIRTUAL_HOST: http://cloud.blender.org/*,https://cloud.blender.org/*,http://pillar-web/*
+   VIRTUAL_HOST: http://cloud.blender.org/*,https://cloud.blender.org/*,http://blender-cloud/*,https://blender-cloud/*
    VIRTUAL_HOST_WEIGHT: 10
    FORCE_SSL: "true"
    GZIP_COMPRESSION_TYPE: "text/html text/plain text/css application/javascript"