🐳 Consolidating env vars in a single file

docker-compose.env

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+UNDERLYING_HOSTNAME=ghost
+COMICS_DIRECTORY=/Users/rishi/work/threetwo/comics
+USERDATA_DIRECTORY=/Users/rishi/work/threetwo/userdata
+
+LOGGER=true
+LOGLEVEL=info
+SERVICEDIR=dist/services
+
+MONGO_URI=mongodb://db:27017/threetwo
+REDIS_URI=redis://redis:6379
+TRANSPORTER=redis://redis:6379
+CALIBRE_EBOOK_META_PATH=/opt/calibre/ebook-meta
+CACHER=Memory