Update Vite & introduce manual code splitting#2761
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Update Vite & introduce manual code splitting#2761
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This PR updates Vite to the latest version, since we were two major versions behind.
The only breaking change to affect us was the deprecation and removal of Vite's previously-built-in
splitVendorChunkPluginplugin, which was used to implement some automatic code-splitting at build-time to optimize the load times of the site.I have added a first pass at a more specific code-splitting strategy, splitting the code based on top-level page routes. This could be further improved in a lot of ways, and will be provided by default if/when we move to using React Router's framework mode (which has a lot of other potential benefits).