Fixed Octocat icon

Author: aimeos

_layouts/default.html

@@ -34,7 +34,7 @@ <h2 class="project-tagline">{{ page.description | default: site.description | de
 			{% if site.github.is_project_page %}
 				<a href="{{ site.github.repository_url }}" class="btn github">View on GitHub</a>
 				<a href="{{ site.github.repository_url }}" class="icon github">
-					<img class="octocat" src="https://github.githubassets.com/images/modules/logos_page/Octocat.png" alt="View on Github" />
+					<img class="octocat" src="/assets/octocat.svg" alt="View on Github" />
 				</a>
 			{% endif %}