HTML links with bookmarks (#) are broken throughout #27
Description
HTML links seem to be broken all the way through the Usage pages wherever there are # signs as bookmarks, e.g.
`The diagonal mirror is generated by doing a [Transpose](../warping/#transpose)`
because the filename ("index.html") is missing. Do these need updating to:
`The diagonal mirror is generated by doing a [Transpose](../warping/index.html#transpose)`
Or is there an easier way of doing that?