feat(main): Add additional envvars to configure Nixery

Previously the code had hardcoded paths to runtime data (the Nix
builder & web files), which have now been moved into configuration
options.

Additionally configuration for the application is now centralised in a
single config struct, an instance of which is passed around the
application.

This makes it possible to implement a wrapper in Nix that will
configure the runtime data locations automatically.

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