This reverts 1478317d149539d74fa4bad8414658fb7119ea07.
Using depot.depotPath in my home-manager configuration results in my
NIX_PATH and home-manager config file path being pointed at a copy of
the depot in the nix store, which makes building from my local depot
checkout a bit cumbersome.
Change-Id: Ib687d3e8147cb32df071d3c19a5300294ea62c0c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2130
Tested-by: BuildkiteCI
Reviewed-by: multi <depot@in-addr.xyz>