pytorch

2a236548 - Switch to official releases of katex and update doc for installing katex. (#27758)

Switch to official releases of katex and update doc for installing katex. (#27758) Summary: katex is a deprecated package in Ubuntu and has been removed in recent releases of Debian. Use npm instead. Pull Request resolved: https://github.com/pytorch/pytorch/pull/27758 Differential Revision: D17891039 Pulled By: ezyang fbshipit-source-id: 53de6e14b2638298e5b61996dcd7ba8de02420a3