Rainfall: Provide a sensible default footer template part

rainfall/parts/footer.html

@@ -1,11 +1,35 @@
-<!-- wp:group {"layout":{"inherit":true}} -->
-<div class="wp-block-group">
-	<!-- wp:group {"style":{"spacing":{"padding":{"top":"80px","bottom":"30px"}}}} -->
-	<div class="wp-block-group" style="padding-top:80px;padding-bottom:30px">
-		<!-- wp:paragraph {"align":"center"} -->
-		<p class="has-text-align-center">Proudly Powered by <a href="https://wordpress.org" rel="nofollow">WordPress</a></p>
-		<!-- /wp:paragraph -->
-	</div>
-	<!-- /wp:group -->
-</div>
+<!-- wp:group {"layout":{"inherit":false}} -->
+<div class="wp-block-group"><!-- wp:group {"style":{"spacing":{"padding":{"top":"80px","bottom":"30px"}}},"layout":{"inherit":false}} -->
+	<div class="wp-block-group" style="padding-top:80px;padding-bottom:30px"><!-- wp:columns -->
+		<div class="wp-block-columns"><!-- wp:column -->
+			<div class="wp-block-column"><!-- wp:site-title {"textAlign":"left","fontSize":"small"} /--></div>
+			<!-- /wp:column -->
+			
+			<!-- wp:column -->
+			<div class="wp-block-column"></div>
+			<!-- /wp:column -->
+			
+			<!-- wp:column -->
+			<div class="wp-block-column"><!-- wp:columns -->
+				<div class="wp-block-columns"><!-- wp:column -->
+					<div class="wp-block-column"><!-- wp:paragraph -->
+						<p><a href="https://facebook.com/">Facebook</a></p>
+						<!-- /wp:paragraph --></div>
+					<!-- /wp:column -->
+					
+					<!-- wp:column -->
+					<div class="wp-block-column"><!-- wp:paragraph {"align":"center"} -->
+						<p class="has-text-align-center"><a href="https://twitter.com/">Twitter</a></p>
+						<!-- /wp:paragraph --></div>
+					<!-- /wp:column -->
+					
+					<!-- wp:column -->
+					<div class="wp-block-column"><!-- wp:paragraph {"align":"right"} -->
+						<p class="has-text-align-right"><a href="https://instagram.com/">Instagram</a></p>
+						<!-- /wp:paragraph --></div>
+					<!-- /wp:column --></div>
+				<!-- /wp:columns --></div>
+			<!-- /wp:column --></div>
+		<!-- /wp:columns --></div>
+	<!-- /wp:group --></div>
 <!-- /wp:group -->

rainfall/theme.json

@@ -119,7 +119,10 @@
 			},
 			"core/site-title": {
 				"typography": {
-					"fontWeight": "bold"
+					"fontWeight": "bold",
+					"lineHeight": {
+						"ref": "styles.typography.lineHeight"
+					}
 				},
 				"elements": {
 					"link": {