Restructure documentation layout

docs/guides/toc.yml

@@ -1,17 +1,18 @@
-
-- name: Installing
-  href: installing.md
 - name: Getting Started
-  href: intro.md
-- name: Terminology
-  href: terminology.md
-- name: Logging
-  href: logging.md
-- name: Commands
-  href: commands.md
+  items:
+    - name: Installation
+      href: getting_started/installing.md
+    - name: Your First Bot
+      href: getting_started/intro.md
+    - name: Terminology
+      href: getting_started/terminology.md
+- name: Basic Concepts
+  items:
+    - name: Logging Data
+      href: concepts/logging.md
+    - name: Working with Events
+      href: concepts/events.md
+    - name: Entities
+- name: The Command Service
 - name: Voice
-  href: voice.md
-- name: Events
-  href: events.md
-- name: Code Samples
-  href: samples.md
+- name: Migrating from 0.9