Hacker News Compact and Clear sɣur icetbr

Fits more things on screen and improves UX.
- white background and narrower: essential for readability
- adjusted font color to match contrast
- focus on important stuff: user name to the right, hiding nav commands and reply date
- reworked comments spacing
- less indentation: relying on the vote arrow to differentiate replies
- vertical guide helps identifying indentation level