Remove Windows icons

Discourages Windows usage.

_includes/sections/cloud-storage.html

@@ -11,7 +11,6 @@ description="Similar functionally to the widely used Dropbox, with the differenc
 website="https://nextcloud.com/"
 forum="https://forum.privacytools.io/t/discussion-nextcloud/287"
 github="https://github.com/nextcloud"
-windows=""
 mac=""
 linux=""
 bsd=""
@@ -27,7 +26,6 @@ description="S4 (Simple Secure Storage Service) is Least Authority's verifiably
 website="https://leastauthority.com/"
 forum="https://forum.privacytools.io/t/discussion-least-authority-s4/288"
 github="https://github.com/LeastAuthority"
-windows=""
 mac=""
 linux=""
 bsd=""