This entire site is an argumentative fallacy. There are many other factors involved in the spreading of viruses. Masks are not going to solve the problem and forcing people to start wearing masks isn't going to make people believe that it is a solution.
This is a really cool application. I like that you are advocating for internet privacy. To add on to this, it would be cool if you made a .onion version of the site for even better privacy. Then google isn't collecting my data while I am on the site.
I'm not too familiar with travis/codecov, but maybe you could add "npm install" to your .travis.yml "install" section? That way the dependencies would be downloaded before the scripts ran.