Add Course page (#1844)

* Add Course page

* Added shortcodes and buttons to navigate to the next page

* move course images from layout

* decouple documentation and course layout

* decouple course sidebar

* move accordion js handlers into global unconditional js

* enable search on courses

* allow nested courses

* disable links for now

---------

Co-authored-by: generall <andrey@vasnetsov.com>

qdrant-landing/themes/qdrant-2024/layouts/_default/sitemap.xml

@@ -2,6 +2,15 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
         xmlns:xhtml="http://www.w3.org/1999/xhtml">
     {{  range .Data.Pages }}
+
+        <!-- TODO: remove this once we release the course -->
+
+        {{ if eq .Section "course" }}
+                {{ continue }}
+        {{ end }}
+
+        <!-- TODO: remove this once we release the course -->
+
     {{-     if and (or (eq (isset .Params "sitemapexclude") false) (ne .Params.sitemapExclude true)) (ne .Permalink "") }}
     <url>
         <loc>{{ .Permalink }}</loc>{{ if not .Lastmod.IsZero }}