Add bankrupt, layoff, and pay cut info

[yxjiang]

As some companies were bankrupted, some started to layoff, and some started to apply pay cut. It would be time to add such information as well.

[yxjiang]

Actually there is already a real time dashboard, https://candor.co/hiring-freezes/

[krishnatre-s]

perhaps both websites can be href-ed? @phildini @drewbrew
can explore with candor.co if it sounds a good thing

[drewbrew]

At this point, we don't have the time or people to maintain something like this. Let's let the candor list and http://layoffs.fyi/tracker/ handle that need, in my opinion.