0.0.0 version for website package

we don't have to set it since we never publish the website to npm, and
bumping the version does nothing useful

0.0.0 is from here: https://github.com/yarnpkg/yarn/issues/5936#issuecomment-395912169

see that issue for details on how this was fixed with yarn@2, but we're
still on yarn@1.22

packages/website/package.json

@@ -1,6 +1,6 @@
 {
   "name": "squiggle-website",
-  "version": "0.3.0",
+  "version": "0.0.0",
   "private": true,
   "license": "MIT",
   "scripts": {