Convert explore tabs to pajamas

Changelog: other

app/views/explore/projects/_nav.html.haml

 .top-area
-  %ul.nav-links.nav.nav-tabs
-    = nav_link(page: [explore_projects_path, explore_root_path]) do
-      = link_to explore_projects_path do
-        = _('All')
-    = nav_link(page: starred_explore_projects_path) do
-      = link_to starred_explore_projects_path do
-        = _('Most stars')
-    = nav_link(page: trending_explore_projects_path) do
-      = link_to trending_explore_projects_path do
-        = _('Trending')
+  = gl_tabs_nav({ class: 'gl-display-flex gl-flex-grow-1 gl-border-none'}) do
+    = gl_tab_link_to _('All'), explore_projects_path, { item_active: current_page?(explore_projects_path) || current_page?(explore_root_path) }
+    = gl_tab_link_to _('Most stars'), starred_explore_projects_path
+    = gl_tab_link_to _('Trending'), trending_explore_projects_path
 
   .nav-controls
     - unless current_user