Add a site map

We are about to migrate all the wiki pages to this site, therefore it
makes sense to have a page listing all of the site's pages.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

content/sitemap.md

@@ -0,0 +1,6 @@
+---
+title: Site Map
+---
+# Site Map
+
+{{< sitemap >}}

layouts/partials/footer.html

@@ -9,6 +9,7 @@
 			<li><a href="https://gitforwindows.org/git-snapshots/">Snapshots</a></li>
 			<li><a href="https://github.com/git-for-windows/build-extra/blob/master/ReleaseNotes.md#licenses">Licenses</a></li>
 			{{- end }}
+			<li><a href="./sitemap.html">Site Map</a></li>
 		</ul>
 		<a href="index.html"><h1 class="gittext lowercase">Git for Windows</h1></a>
 		<div class="stud"></div>

layouts/shortcodes/sitemap.html

@@ -0,0 +1,7 @@
+<ul class="page-index">
+{{ range .Site.Pages }}
+  {{ if ne "" .Title }}
+  <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
+  {{ end }}
+{{ end }}
+</ul>