Although it's great to self-host your web fonts instead of using a service like Google Fonts (that may decrease the privacy of your site's visitors, because Google can log IP addresses and other stuff), it's probably not necessary to use web fonts at all. Every PC or tablet or phone has a lot of fonts already pre-installed, which are more than perfect for displaying your website (unless you take a lot of care about corporate design or your personal brand and require a specific font).
I'm currently in the process of improving my sites Hugo theme. I removed features I never used and simplified unorganized HTML and CSS, to enable adding new features (like better support for IndieWeb things) later. My theme was once based on the Hugo theme Mainroad, but I modified so much over the time that almost nothing is left from the original theme. The theme, which was a port of a WordPress theme called “MH Magazine”, supported Internet Explorer 11, but when I discovered CSS variables, I made use of them and broke Internet Explorer support on the way.
I generally prefer dark user interfaces wherever possible. My phone is set to a dark mode (as far as there is a dark mode in Android Pie), apps like Telegram are set to dark mode and on the desktop I prefer dark modes too. But the most important software I use everyday is a web browser. And most websites don't support a dark mode yet (because there was no native browser feature for that until recently).