Documentation pdf building

[daquinteroflex]

To sort out the pdf building bugs and visual requirements of the docs:

• robots.txt is incompatible with the latex functions for reasons I don't understand, not possible to build it with them accordingly.
• Include images and image paths within the repository tidy3d-faq#18
• There are loads of invalid character warnings.
• Get it to build
• Write up a tidy3d.sty file to improve the styling of the pdf.

I have a serious concern how correct or nice this documentation might get to be.

References:

• https://stackoverflow.com/questions/39534718/how-to-create-a-pdf-out-of-sphinx-documentation-tool
• Can't use https://www.mos6581.org/rinohtype/master/ because of GNU GPL
• https://tex.stackexchange.com/questions/8750/make-your-own-sty-files