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

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

qdrant-landing/content/course/essentials/day-0/_index.md

@@ -0,0 +1,13 @@
+---
+title: Day 0
+isLesson: true
+weight: 1
+---
+
+{{< date >}} Day 0 {{< /date >}}
+
+# Setup, Orientation & “Hello Qdrant!”
+
+Welcome to Day 0! Today we’ll lay the foundation for everything in the course. Let’s get started with setting up your environment, and creating your first collection. By the end of this, you’ll have your first similarity search running! In total, the three videos are about 20 minutes total.
+
+## Video 01: Course Overview

qdrant-landing/content/course/essentials/day-0/video-02.md

@@ -0,0 +1,9 @@
+---
+title: Video 02
+weight: 2
+---
+
+{{< date >}} Day 0 {{< /date >}}
+
+# Video 02: Set Up Your Environment
+

qdrant-landing/content/course/essentials/day-0/video-03.md

@@ -0,0 +1,9 @@
+---
+title: Video 03
+weight: 3
+---
+
+{{< date >}} Day 0 {{< /date >}}
+
+# Video 03: Create a Collection
+