refactor: drop config.toml and Viper, use DEEZER_ARL env var

go.sum

@@ -13,58 +13,32 @@ github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
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@@ -144,7 +118,5 @@ golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58
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