gogs/templates/explore/navbar.tmpl

<div class="four wide column">
	<div class="ui vertical menu navbar">
		<div class="header item">{{.i18n.Tr "explore"}}</div>
		<a class="{{if .PageIsExploreRepositories}}active{{end}} item" href="{{AppSubURL}}/explore/repos">
			<span class="octicon octicon-repo"></span> {{.i18n.Tr "explore.repos"}}
		</a>
		<a class="{{if .PageIsExploreUsers}}active{{end}} item" href="{{AppSubURL}}/explore/users">
			<span class="octicon octicon-person"></span> {{.i18n.Tr "explore.users"}}
		</a>
		<a class="{{if .PageIsExploreOrganizations}}active{{end}} item" href="{{AppSubURL}}/explore/organizations">
			<span class="octicon octicon-organization"></span> {{.i18n.Tr "explore.organizations"}}
		</a>
	</div>
</div>