Replace text-align classes with tailwind (#33905)

Small refactor to remove these CSS classes in favor of tailwind.

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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/install.tmpl

@@ -1,7 +1,7 @@
 {{template "base/head" .}}
 <div role="main" aria-label="{{.Title}}" class="page-content install">
 	<div class="ui grid install-config-container">
-		<div class="sixteen wide center aligned centered column">
+		<div class="sixteen wide tw-text-center centered column">
 			<h3 class="ui top attached header">
 				{{ctx.Locale.Tr "install.title"}}
 			</h3>