Opt-in to non-dataset modules

[isaisabel]

As a user who is creating their own instance of the ATT&CK Website, I want my instance to be uncluttered by ATT&CK-centric functionalities. I mostly want to use my personal instance for exploring the contents of the knowledge base.

Modules that do not pertain to the ATT&CK dataset itself should not be built by default. They should only be added if the user explicitly specifies them with build arguments. This should also be stated clearly in the CLI documentation.

Modules that don't need to be built under the default arguments:

• Resources
• Versions (preserved current and previous)
• Contribute
• Blog

See also #240.