- Upgrade heroicons to 2.6.0, adds support for heroicons_mirco
- Remove/upgrade sprite icons
- Update icons in the global messages widget
- Remove unused bgg-logo sprite
- Update calendar icon with heroicon
- Update anchor-link icon
- Remove speech-bubble icon and link—-open-feed, link--close-feed and
link—to-top
- Remove arrow-up and arrow-down
- Remove arrow-split
- Remove "website" icon
- Remove “error” icon
- Update like & dislike button in the screening section
 - Remove 'bulb' svg from sprite
 - Remove 'hero-home-left-pixels' sprite
 - Remove 'hero-home-right-pixels' from sprite
 - Remove 'magnifying-glass' svg from sprite
-  Remove 'person-icon' and profile_button.html
 - Replace 'caret-down' and 'caret-up' icon
 - Remove 'side-arrow' from svg sprite
 - Remove 'add-user' icon, replace with 'user-plus'
 - Remove 'logo-desktop', 'logo-mobile' and 'logo-desktop--dark' icons
 - Remove 'logo-mobile-no-text' icon
 - Remove 'logo-mobile-dark' and 'logo-desktop--dark-alt'
 - Remove 'hero-standard-left-pixels' and 'hero-standard-right-pixels'
 - Remove 'eye' icon and replace with heroicon 'eye'
- Remove 'exclamation-point' icon and replace by heroicon
exlaimation-circle
 - Remove 'github' icon
 - Remove 'person-icon' and profile_button.html
 - Replace 'caret-down' and 'caret-up' icon
 - Remove 'side-arrow' from svg sprite

closes #3703 
depends on #3722