Support reading inboxes from ~/.public-inbox/config

A client may mirror and configure inboxes locally.  Doing so enables
fast local access to public-inbox-httpd and public-inbox-nntpd.  And
with the next pubic-inbox release (v1.7), it will be necessary to set
up local externals for lei.

That can lead to a good amount of information being duplicated between
the piem-inboxes option and ~/.public-inbox/config.  To avoid this,
let users set an option to enable collecting information from
public-inbox's configuration.

This relies on code getting the list of inboxes with
piem-merged-inboxes rather than inspecting piem-inboxes directly.
That should be okay because at this point there should be very few
third-party callers.  An alternative would be to merge values from the
configuration into the value of piem-inboxes.  That'd let callers
continue to inspect public-inboxes, but I'd prefer not to touch the
value of a user option.

Message-Id: <20210610185943.14155-5-kyle@kyleam.com>

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