add(docs): Note default path to config in docs #588

Job	Run time
Generate crates matrix	16s
Check crates matrix	5s
Build zebrad crate	6m 44s
Build zebra-utils crate	5m 43s
Build zebra-test crate	1m 34s
Build zebra-state crate	6m 44s
Build zebra-script crate	4m 26s
Build zebra-scan crate	1s
Build zebra-rpc crate	1s
Build zebra-node-services crate	1s
Build zebra-network crate	1s
Build zebra-consensus crate	1s
Build zebra-chain crate	1s
Build tower-fallback crate	1s
Build tower-batch-control crate	1s
Open or update issues for building crates individually failures	1s
	25m 41s

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