Some problematic audits results + PWA support

[bbb651]

I've ran a test using lighthouse in Chrome 87 (on a Windows 10 Pro 19041) and got the following results:
Summary

Full Results
Results.zip

Some notable things are missing a lot of SEO tags, accessibility is not great due to using one canvas instead of elements a screen reader can read but there's no real way to solve that, and PWA is missing (I think it can be really useful, as it would make it function similarly to a native app, with almost every browser supporting it on mobile and chrome supporting it on desktop).

I might make a pull request trying to solve some of these things.