Organize application logic by core/feature breakouts, add dhall configuration support and add a range of new config options in the Reader, add example configuration/deployment files

examples/Dockerfile

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+FROM haskell:9.0.2
+
+WORKDIR /app
+ADD . /app
+
+RUN stack setup
+RUN stack build --copy-bins --local-bin-path ./
+
+EXPOSE 3000
+
+CMD ./Purr-exe

examples/config.dhall

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+-- /config.dhall
+{ hostname = "localhost"
+, port = +3001
+, environment = "development"
+, adminDB = "admin"
+, dataDB = "data"
+, collection = "store"
+, mongoUsername = "root"
+, mongoPassword = "REPLACEME"
+}