General App Updates

[WraySmith]

These were not completed as part of v1.0.0 of the app but are items that may be completed in the future:

• Consider modification to tab 1 figure 1 to potentially add a toggle for turning on/off points and have all selections shows a mean line (potentially with quantiles shaded) - on the fly mean lines/quantiles in Altair would either need to be preprocessed or use the experimental Altair transformer (originally noted in Issues #34).
• Adding a year range filter to all graphs in app.
• Adding a user rating count filter to the 3D graph.
• Improve some of the app layouts to scale better on different browsers.
• Alphabetize lists
• Provide option to filter categories instead of multiple select on 3D explorer.