website: Remove backdrop-filter: blur from items

This causes a significant slowdown and lag during scrolling in firefox on my
machine, and it seems like this isn't an issue only on my machine:
https://old.reddit.com/r/Frontend/comments/186u5wy/hows_the_performance_with_css_blur_filter_and/

Author: yedayak

website/static/style.css

@@ -95,7 +95,6 @@ code {
 
 .item {
   background: rgba(255, 255, 255, 0.07);
-  backdrop-filter: blur(2px);
   border: 1px solid rgba(255, 255, 255, 0.1);
   border-radius: 1rem;
   margin: 1.5rem 0;