Russell: Update the navigation to match Blockbase (#4849)

* Russell: Adds social navigation

* Added blockbase navigation block style

Co-authored-by: Jason Crist <jcrist@pbking.com>

russell/block-template-parts/header.html

@@ -2,7 +2,7 @@
 <div class="wp-block-group site-header" style="padding-bottom:40px">
 	<!-- wp:site-logo /-->
 	<!-- wp:site-title /-->
-	<!-- wp:site-tagline {"fontSize":"tiny"} /-->
-	<!-- wp:navigation {"isResponsive":true,"__unstableLocation":"primary"} /-->
+	<!-- wp:site-tagline {"style":{"typography":{"fontSize":"var(--wp--custom--font-sizes--tiny)"}}} /-->
+	<!-- wp:navigation {"className":"is-style-blockbase-navigation-improved-responsive","itemsJustification":"right","isResponsive":true,"__unstableLocation":"primary","__unstableSocialLinks":"social"} /-->
 </div>
 <!-- /wp:group -->