Merge pull request #31941 from overleaf/mj-default-theme

[web] Change default data-theme attribute to light

GitOrigin-RevId: adabde890746da24728bd1cd47562eb769893ee0

services/web/app/views/layout-base.pug

@@ -104,7 +104,7 @@ html(
 			'website-redesign': isWebsiteRedesign === true || websiteRedesignOverride,
 			'application-page': isApplicationPage,
 		}
-		data-theme='default'
+		data-theme='light'
 	)
 		if settings.recaptcha && settings.recaptcha.siteKeyV3
 			script(