Change all asset links

Assets are served from the root. Hope nobody is serving this site in a subfolder for some reason! :)

_includes/sections/self-contained-networks.html

@@ -8,7 +8,7 @@
 
   {% include card.html color="success"
   title="Tor Browser"
-  image="assets/img/tools/Tor-Project.png"
+  image="/assets/img/tools/Tor-Project.png"
   url="https://www.torproject.org/"
   tor="http://expyuzz4wqqyqhjn.onion"
   footer='OS: Windows, macOS, Linux, <a href="https://mike.tig.as/onionbrowser/">iOS</a>, <a href="https://www.torproject.org/docs/android.html.en">Android</a>, <a href="https://github.com/torbsd/openbsd-ports">OpenBSD.</a>'
@@ -17,7 +17,7 @@
 
   {% include card.html color="primary"
   title="I2P Anonymous Network"
-  image="assets/img/tools/I2P.png"
+  image="/assets/img/tools/I2P.png"
   url="https://geti2p.net/"
   footer="OS: Windows, macOS, Linux, Android, BSD / Solaris."
   description="The Invisible Internet Project (I2P) is a computer network layer that allows applications to send messages to each other pseudonymously and securely. Uses include anonymous
@@ -26,7 +26,7 @@
 
   {% include card.html color="warning"
   title="The Freenet Project"
-  image="assets/img/tools/Freenet.png"
+  image="/assets/img/tools/Freenet.png"
   url="https://freenetproject.org/"
   footer="OS: Windows, macOS, Linux."
   description="Freenet is a peer-to-peer platform for censorship-resistant communication. It uses a decentralized distributed data store to keep and deliver information, and