`nim doc main.nim` generates broken html (css file absent) regression possibly introduced in #12816 ### Example real life example: https://disruptek.github.io/gittyup/gittyup.html minimal example: ```nim proc fun*()= ## some proc discard ``` ### Current Output  ### Expected Output as in nim 1.0.4:  ### Possible Solution * either embed the css in html file or update instructions in `nim --fullhelp` for `nim doc` ### Additional Information D20191231T070930 chrome console shows: ``` nimdoc.css:1 Failed to load resource: net::ERR_FILE_NOT_FOUND dochack.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND ``` it used to show: ``` dochack.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND ``` * working in version 1.0.4 * broken in b67dea7a33d24cd54afa8bd37677d066f4be0da1