Add missing `.steps-vertical` classes in docs (#2348)

.changeset/twelve-rings-sleep.md

@@ -0,0 +1,5 @@
+---
+"@tabler/docs": patch
+---
+
+Add missing `.steps-vertical` classes in docs

docs/content/ui/getting-started/how-to-contribute.md

@@ -37,7 +37,7 @@ Follow these steps to set up Tabler for development:
 
 To set up Tabler for development, follow these steps:
 
-<div class="steps">
+<div class="steps steps-vertical">
 
 ### Ensure Node.js and npm are installed
 

docs/content/ui/getting-started/installation.md

@@ -7,7 +7,7 @@ description: "Set up Tabler: HTML, CSS, JS, and build stunning UIs."
 
 This guide will take you through the essential steps to set up Tabler in your project, from creating a basic HTML file to incorporating Tabler’s styles and scripts. Let’s dive in!
 
-<div class="steps">
+<div class="steps steps-vertical">
 
 ### Create a Basic HTML File