Using output file name for first page (--out-file FILE is not supported)

[interkosmos]

Description

Given is an Asciidoc source file foo.adoc. If translated with asciidoctor-multipage using the command-line argument -o, the passed output file name is ignored in the ToC:

$ asciidoctor-multipage -a webfonts! -D /tmp/foo/ -o index.html foo.adoc

The first page of the multi-page output is named index.html. However, the link in the ToC points to foo.html.

Expected Behaviour

Link to first page in ToC points to index.html.

[owenh000]

@interkosmos, thanks for the report!