Minimize app.js bundle size

[williamjallen]

The app.js entry point loads first on every page load, blocking any data loading from occurring until the asset is downloaded, parsed, and run. This PR attempts to shrink the size of the compiled asset as much as possible by doing the following things:

• Using named imports for better tree shaking.
• Moving axios initialization to ApiLoader.js, a library which is only used on a dwindling handful of pages at this point.
• Removing the unused apollo-components library entirely since it's no longer used, and shouldn't be used in the future.