Global variable management

[PoorBillyPilgrim]

Devise a strategy for managing the main variables for the IIIF research environment. For the metadata -> image -> manifest -> viewer pipeline, I need to define a consistent manner for the server ecosystem. The likely best strategy is to create a ENV

Create a config/env file for managing locations for

1. image server
2. manifest server
3. collection src

[PoorBillyPilgrim]

Implement global variable control using dotenv

[PoorBillyPilgrim]

In order for dotenv to work with import, you can preload dotenv/config by running it from the command line. Be sure to run it from the same folder that node_modules is located. So, for example, since buildManifest.js is located in src, then the command would look like node --require dotenv/config src/buildManifest.js