[BUG] when running jupinx `--files` the index_toc page is not included

[mmcky]

@AakashGfude I have tried to figure this one out but failed so far.

If you run

jupinx -cws --files=source/rst/arma.rst

the page build (along with associated index files -- except for the index_toc page? Do you know why this is the case. Sphinx seems to think index_toc is not a dependent / linked file. This makes local previews difficult.

[AakashGfude]

@mmcky I will have a go at this, this week.