Update navigation: new menu, active page highlight, centered navbar without logo

layouts/partials/header.html

@@ -0,0 +1,19 @@
+{{- $page := . -}}
+{{- $bib := slice "book" "article" "inbook" "inproceedings" "phdthesis" "techreport" "websites" -}}
+<nav class="site-navbar">
+  <ul id="menu" class="menu">
+    {{ range .Site.Menus.main -}}
+      {{- $active := false -}}
+      {{- if eq .URL "/" -}}
+        {{- $active = $page.IsHome -}}
+      {{- else if hasPrefix $page.RelPermalink .URL -}}
+        {{- $active = true -}}
+      {{- else if and (eq .URL "/notes/") (in $bib $page.Section) -}}
+        {{- $active = true -}}
+      {{- end }}
+      <li class="menu-item">
+        <a class="menu-item-link{{ if $active }} active{{ end }}"{{ if $active }} aria-current="page"{{ end }} href="{{ .URL | safeURL }}">{{ .Name }}</a>
+      </li>
+    {{- end }}
+  </ul>
+</nav>