lei_mirror: support --remote-manifest=URL

Since PublicInbox::WWW already generates manifest.js.gz, I'm
using an alternate path with PublicInbox::WwwStatic to host the
manifest.js.gz for coderepos at an alternate location.  The
following snippet lets me host
https://yhbt.net/lore/pub/manifest.js.gz for mirrored git
repositories, while https://yhbt.net/lore/manifest.js.gz
(no `pub') remains for inbox mirroring.

==> sample.psgi <==
use PublicInbox::WWW;
use PublicInbox::WwwStatic;
my $www = PublicInbox::WWW->new; # use default PI_CONFIG
my $st = PublicInbox::WwwStatic->new(docroot => '/path/to/code');
my $www_cb = sub {
	my ($env) = @_;
	if ($env->{PATH_INFO} eq '/pub/manifest.js.gz') {
		local $env->{PATH_INFO} = '/manifest.js.gz';
		my $res = $st->call($env);
		return $res if $res->[0] != 404;
	}
	$www->call($env);
};
builder {
	enable 'ReverseProxy';
	enable 'Head';
	mount '/lore' => $www_cb;
}

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