Fix indentation for all pages

spring-shell-docs/modules/ROOT/pages/getting-started.adoc

@@ -1,5 +1,6 @@
 [[getting-started]]
-== Getting Started
+= Getting Started
+
 To see what Spring Shell has to offer, we can write a trivial _hello world_
 shell application that has a simple argument.
 
@@ -7,7 +8,7 @@ IMPORTANT: _Spring Shell_ is based on _Spring Boot_ {spring-boot-version} and
 _Spring Framework_ {spring-version} and thus requires _JDK 17_.
 
 [[creating-a-project]]
-=== Creating a Project
+== Creating a Project
 
 For the purpose of this tutorial, we create a simple Spring Boot application by
 using https://start.spring.io where you can choose _Spring Shell_ dependency.
@@ -98,7 +99,7 @@ TIP: Check out <<using-shell-customization-logging>> making logging to work
 better with shell apps.
 
 [[using-spring-shell-your-first-command]]
-=== Your First Command
+== Your First Command
 
 Now we can add our first command. To do so, create a new class (named whatever you want) and
 annotate it with `@ShellComponent` which is a variation of `@Component` that is used to restrict