fix: Improve S2 docs bundle size

[devongovett]

• Updates Parcel to improve code splitting and fix styling issues.
• Removes card descriptions, which avoids pulling in 10MB of docs json.
• Code splits search menu so it only loads the contents when it first opens
• Code splits the illustrations page so only the svgs for the active illustration type gets loaded (though it's still pretty big)
• Only includes English translations in the bundle since we hard code the Provider to en-US anyway

[rspbot]

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[devongovett]

Bug found on the illustrations page when wrapping a collection in Suspense: when switching illustration types, the content would not update in the collection. This was because during Suspense React "unmounts" effects by calling their cleanup functions, but doesn't actually remove the component from the DOM. Before it re-mounts the effect, it removes the old content from the collection. We had this optimization where we ignored removals when unmounted, so these would never be processed. I tested in Storybook with our large collection stories and didn't notice a performance issue without this, so perhaps we fixed the original issue somewhere else in the meantime.

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs