Upgrade Dependencies - React 18

[ds17f]

When trying to work with this project and modern components I ran into a lot of issues with React versions. I also saw that the node requirement was out of date. I set out to upgrade react, and any other significant dependencies.

At this time, there are still some minor warnings during an initial yarn install. I wasn't able to upgrade raven-js -> @sentry/browser and I'll leave that work to somebody else as it doesn't seem to be breaking the builds or causing havock.

Please take a look at the package.json for a complete list of the upgrades and changes, but here are some notes:

• react-router-dom: a significant upgrade from 4x -> 6x. Fortunately the router stuff was relatively simple and the upgrade didn't involve a tremendous amount of work.
• react: Moving to 18 required some changes to the initial startup in index.js, but this probably wasn't particularly impactful.
• node-sass: replaced with sass as node-sass is deprecated.
• bootstrap: upgraded to 5. I'll admit that I just hacked the css to make it look like the old version. I'm sure there are better ways to do this, and somebody familiar with bootstrap and css might take that work on.
• Updated the URL for the install of jsnes via github. It didn't work for me on yarn as it was, but works now.

I bumped the major version of the project from 0.x to 1.x. These changes are NOT backwards compatible, so we should bump the major version. With that said, semver says to stay on 0.x branch if you're "Pre-release." I'm not sure if this project is. I'm open to changes to the semver if a project maintainer feels that it shouldn't be 1.0.0.

[ds17f]

It looks like deploy/netlify is breaking because of an old version of ubuntu. I don't know how to fix that but would be happy to if it can be done as part of this PR.