Cleanup readme, update and/or remove links

readme.md

@@ -31,9 +31,8 @@ General purpose icons used everywhere.
 - [IconPark](https://github.com/bytedance/IconPark#readme) - IconPark gives access to more than 1,400 high-quality icons, and introduces an interface for customizing your icons. ([Website](https://iconpark.bytedance.com))
 - ICONSVG - Quick customizable SVG icons, easily customize strokes, ends, and joins of paths. ([Website](https://iconsvg.xyz))
 - [Ion icons](https://github.com/ionic-team/ionicons#readme) - The premium icon font for Ionic Framework and web apps everywhere. ([Website](https://ionicons.com))
-- [Material design icons](https://github.com/google/material-design-icons#readme) - Material Design icons by Google. ([Website](https://material.io/tools/icons))
+- [Material design icons](https://github.com/google/material-design-icons#readme) - Material Design icons by Google. ([Website](https://fonts.google.com/icons))
 - [Octicons](https://github.com/primer/octicons#readme) - A scalable set of icons handcrafted with <3 by GitHub. ([Website](https://octicons.github.com))
-- [Open Iconic](https://github.com/iconic/open-iconic#readme) - Open Iconic is the open source sibling of Iconic. ([Website](https://useiconic.com/open))
 - [Picon](https://github.com/yne/picon#readme) - Small ligature-based icon font and SVG. ([Website](https://yne.fr/picon))
 - [Radix Icons](https://github.com/radix-ui/icons) - A crisp set of 15×15 icons designed by the Modulz team. ([Website](https://icons.modulz.app/))
 - [Remix Icon](https://github.com/Remix-Design/RemixIcon#readme) - Remix Icon is a set of open-source neutral-style system symbols for designers and developers. ([Website](https://remixicon.com))
@@ -81,7 +80,6 @@ Icons made out of CSS only (that are not downloadable).
 
 Not open-source/free, but still awesome enough.
 
-- [Iconic](https://useiconic.com) - The definitive icon set designed for the modern web.
 - [Nucelo Icons](https://nucleoapp.com/premium-icons) - A premium library of SVG icons for iOS, Android & web projects.
 
 ## License