remove cairo dependency in docs

Merge pull request 3b1b#1284 from niedong/typo-fix

fix typo docstring in scene_file_writer.py

Merge pull request 3b1b#734 from zombie110year/master

latex can't recognize path seperator \\ in windows

remove extraneous newline

udpate documentation link

allow pycairo>=1.18.0 for windows

Merge pull request 3b1b#607 from 3b1b/video_dir

Add --video_output_dir flag

Merge pull request 3b1b#607 from 3b1b/video_dir

Add --video_output_dir flag

Add social badges README

Logo (3b1b#537)

Add the graph created by @Elteoremadebeethoven as a logo