⚒️ ✨ 'Flex' - Major update and 600+ new icons

⚒️ Improvements
Applied key shapes guidelines to all icons
Improved legibility and consistency
✨ New icons
Added 600+ new icons
 with a special focus on the 'Interface' category
Brand new 'Business' and 'Arrows' categories
➡️ Browse all Flex Line icons here
➡️ Browse all Flex Duo icons here
➡️ Browse all Flex Solid icons here
➡️ Browse all Flex Flat icons here