add Icons8 to icon options (#25763)

[Icons8](https://icons8.com/) is a great resource for icons. They provide 15 different icon styles, exportable as fonts or svg
twbs · Mar 8, 2018 · 2b86193 · 2b86193
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diff --git a/docs/4.0/extend/icons.md b/docs/4.0/extend/icons.md
@@ -26,3 +26,4 @@ While we haven't tried these out, they do look promising and provide multiple fo
 - [Dripicons](http://demo.amitjakhu.com/dripicons/)
 - [Ikons](http://ikons.piotrkwiatkowski.co.uk/)
 - [Glyph](http://glyph.smarticons.co/)
+- [Icons8](https://icons8.com/)