refactor: Move form templates and styles to common directory

pkg/common/styles/text/header.templ

@@ -0,0 +1,15 @@
+package text
+
+import "github.com/onsonr/sonr/pkg/common/styles/layout"
+
+templ Header(title string, subtitle string) {
+	<div class="flex flex-col items-center justify-center h-full">
+		<h1 class="text-3xl font-bold mb-2.5">
+			{ title }
+		</h1>
+		<p class="text-lg text-neutral-500">
+			{ subtitle }
+		</p>
+	</div>
+	@layout.Spacer()
+}