Remove usage of github.com/spf13/viper for reading in config from environment variables and read them in manually instead #73
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We currently use viper to read the
warrant.yamlconfig file and/or read env vars and assign them into ourConfigstruct. In order to get the latter working, we've already had to write quite a bit of custom code. Now we've noticed that viper does not correctly return aviper.ConfigFileNotFoundErrorwhen the configured yaml config file is not found, so the library doesn't really provide much value. As a result, I've decided to remove it and instead implement our own yaml file parsing + env var parsing. This PR adds that.