Remove old tests from the website

[alexpetros]

Description

The website used to host every past test suite, copied into the www directory. We no longer need that on the website (and it makes the codebase impossible to search) so I removed all the old tests and the new tests are hosted simply at /test.

I also replaced the www.js script with a simpler www.sh one (since we no longer need to do anything besides copying, really), which allowed me to remove a node dependency that was only used in that script.

This has the benefit of making the repo 3.5 million (!!) lines of code smaller. It's also part 1 of my plan to better automate our release process.

Testing

Deployed locally and it works. You can still run npm run www to build the test suite, it just uses bash now. Obviously this diff is preposterous but the only parts that matter are www.sh and the package.json, which thankfully github puts at the top.

Little shell one-liner to verify that I didn't change any source files (shows all the modified directories up to two levels):

$ git diff head^ --name-only | awk -F / '{print $1"/"$2}' | sort | uniq -c
   1 package-lock.json/
   1 package.json/
   1 scripts/www.js
   1 scripts/www.sh
5330 www/static