Make App Size Smaller

[jameskerr]

The app right now comes in at 668.5 MB.

I found that we include the whole zed repo in the node_modules zed package. We can only publish the javascript files we need using the "files" keyword in the package.json.

I also remember Mason saying that we include all the source code and tests in the build. We can remove those too.

• [ ] Limit what's published in the zed npm package
• [ ] Prune source and tests when building the release