[FAB-9548] Fix image links on layout.html

use pathto to keep links relative

Change-Id: Id60c9702630dbd83d256166db31257f05890a91c
Signed-off-by: Dohyeon Kim <nero.union12@gmail.com>
Signed-off-by: Arnaud J Le Hors <lehors@us.ibm.com>
(cherry picked from commit 6238d58)

Author: dohvis

docs/source/_templates/layout.html

@@ -1,10 +1,11 @@
 {% extends "!layout.html" %}
 {% block sidebartitle %}
 {{ super() }}
-<br><img style="background-color: #fff; height: unset; width: unset;" alt="_images/hyperledger_fabric_logo_color.png" src="_images/hyperledger_fabric_logo_color.png" />
+
+<br><img style="background-color: #fff; height: unset; width: unset;" alt="Hyperledger Fabric" src={{ pathto("_images/hyperledger_fabric_logo_color.png",1) }} />
 <br>
-<a href="https://github.com/hyperledger/fabric"><img style="padding: 0px; margin: auto auto auto auto;" alt="GitHub" src="_static/images/github_button.png"/></a>
-&nbsp;<a href="https://stackoverflow.com/questions/tagged/hyperledger-fabric"><img style="padding: 0px; margin: auto auto auto auto;" alt="StackOverflow" src="_static/images/stackoverflow_button.png"/></a>
-&nbsp;<a href="https://chat.hyperledger.org"><img style="padding: 0px; margin: auto auto auto auto;" alt="Rocket Chat" src="_static/images/rocketchat_button.png"/></a>
-&nbsp;<a href="https://www.youtube.com/playlist?list=PL0MZ85B_96CH7wvtrRzV7SvtRY0sI0DEg"><img style="padding: 0px; margin: auto auto auto auto;" alt="Youtube Channel" src="_static/images/youtube_button.png"/></a>
+<a href="https://github.com/hyperledger/fabric"><img style="padding: 0px; margin: auto auto auto auto;" alt="GitHub" src={{ pathto("_static/images/github_button.png",1) }}/></a>
+&nbsp;<a href="https://stackoverflow.com/questions/tagged/hyperledger-fabric"><img style="padding: 0px; margin: auto auto auto auto;" alt="StackOverflow" src={{ pathto("_static/images/stackoverflow_button.png",1) }}/></a>
+&nbsp;<a href="https://chat.hyperledger.org"><img style="padding: 0px; margin: auto auto auto auto;" alt="Rocket Chat" src={{ pathto("_static/images/rocketchat_button.png",1) }} /></a>
+&nbsp;<a href="https://www.youtube.com/playlist?list=PL0MZ85B_96CH7wvtrRzV7SvtRY0sI0DEg"><img style="padding: 0px; margin: auto auto auto auto;" alt="Youtube Channel" src={{ pathto("_static/images/youtube_button.png",1) }}/></a>
 {% endblock %}