Attain > 90 for webpage performance metrics

[yangshun]

• Pagespeed - https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fv3.nusmods.com%2F&tab=mobile
• Lighthouse - https://developers.google.com/web/tools/lighthouse/
• Yslow - http://yslow.org/

[zameschua]

Interested, but will probably require a lot of guidance for this!

Report from PageSpeed Insights

Report from lighthouse

Progressive Web-appness, related #319

Performance

Accessibility

[zameschua]

Will look into integrating Webpack code splitting first