Rename BP_WEB_SERVER to a variable name that expresses behavior better

[Waterstraal]

The variable BP_WEB_SERVER will generate a default nginx.conf when the value is set to nginx. The variable name does not express this behavior, and is confusing in my opinion.

Describe the Enhancement

BP_WEB_SERVER is renamed to a more expressive variable name.

Possible Solution

BP_WEB_SERVER is renamed to a more expressive variable name such as:

• BP_NGINX_GENERATE_DEFAULT_CONFIGURATION
• BP_GENERATE_DEFAULT_NGINX_CONFIGURATION
• BP_GENERATE_DEFAULT_WEBSERVER_CONFIGURATION