Refactor configuration

- No longer use config npm package
- Prefer config from env vars, though still has support for config file
- No longer writes a config file for database config
- Writes keys to a new file in /data folder
- Removes a lot of cruft and improves config understanding

backend/yarn.lock

@@ -677,13 +677,6 @@ concat-map@0.0.1:
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
   integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
 
-config@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/config/-/config-3.3.1.tgz#b6a70e2908a43b98ed20be7e367edf0cc8ed5a19"
-  integrity sha512-+2/KaaaAzdwUBE3jgZON11L1ggLLhpf2FsGrfqYFHZW22ySGv/HqYIXrBwKKvn+XZh1UBUjHwAcrfsSkSygT+Q==
-  dependencies:
-    json5 "^2.1.1"
-
 configstore@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/configstore/-/configstore-5.0.1.tgz#d365021b5df4b98cdd187d6a3b0e3f6a7cc5ed96"
@@ -1769,11 +1762,6 @@ json-stable-stringify-without-jsonify@^1.0.1:
   resolved "https://registry.yarnpkg.com/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz#9db7b59496ad3f3cfef30a75142d2d930ad72651"
   integrity sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=
 
-json5@^2.1.1:
-  version "2.2.3"
-  resolved "https://registry.yarnpkg.com/json5/-/json5-2.2.3.tgz#78cd6f1a19bdc12b73db5ad0c61efd66c1e29283"
-  integrity sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==
-
 jsonwebtoken@^9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/jsonwebtoken/-/jsonwebtoken-9.0.0.tgz#d0faf9ba1cc3a56255fe49c0961a67e520c1926d"