hugo, allow specifying the baseURL since it's helpful for SEO and other things, also rename PORT variables to not collide with Ansible's PROD_PORT.

Config/HugoExample/example.env

@@ -16,12 +16,14 @@ BRANCH=prod
 # Please use values YES/TRUE and NO/FALSE.
 
 # Whether to start NGINX
-PROD=YES
-PROD_PORT=8013
+NGINX=YES
+NGINX_PORT=8013
 
 # Whether to start Hugo Server
-DEV=NO
-DEV_PORT=1380
+HUGO=NO
+HUGO_PORT=1380
+
+BASEURL=https://blog.hyperling.com
 
 #
 ## Resources ##