Add new Riot logo (#1002)

_includes/sections/instant-messenger.html

@@ -23,7 +23,7 @@ linux=""
 
 {% include cardv2.html
 title="Riot.im"
-image="/assets/img/tools/riot.png"
+image="/assets/img/tools/Riot.png"
 description="Riot.im is a decentralized free-software chatting application based on the <a href\"https://matrix.org/\">Matrix</a> protocol, a recent open protocol for real-time communication offering E2E encryption. It can bridge other communications via others protocols such as IRC too. <span class=\"badge badge-warning\" data-toggle=\"tooltip\" title=\"The software is currently in beta and the mobile client states 'End-to-end encryption is in beta and may not be reliable. You should not yet trust it to secure data.'\">beta <i class=\"far fa-question-circle\"></i></span>"
 website="https://riot.im/"
 forum="https://forum.privacytools.io/t/discussion-riot-im/665"