Twenty Twenty-One: Add privacy policy link to footer.

If a privacy policy is set, the page links to the footer of the site. As done in the other bundled themes, this link is added using `the_privacy_policy_link()`.

Follow-up to [49216].

Props ryelle, desrosj, kapilpaul, sabernhardt, audrasjb, justinahinon.
Fixes #53445.

git-svn-id: https://develop.svn.wordpress.org/trunk@52082 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentytwentyone/assets/css/ie.css

@@ -5573,6 +5573,10 @@ table.wp-calendar-table caption {
 	font-size: 1.5rem;
 }
 
+.site-footer > .site-info .privacy-policy {
+	margin-top: 15px;
+}
+
 .site-footer > .site-info .powered-by {
 	margin-top: 15px;
 }
@@ -5583,10 +5587,19 @@ table.wp-calendar-table caption {
 		align-items: center;
 	}
 
+	.site-footer > .site-info .site-name {
+		margin-right: 15px;
+	}
+
+	.site-footer > .site-info .privacy-policy,
 	.site-footer > .site-info .powered-by {
 		margin-top: initial;
 		margin-left: auto;
 	}
+
+	.site-footer > .site-info .privacy-policy + .powered-by {
+		margin-left: 15px;
+	}
 }
 
 .site-footer > .site-info a {

src/wp-content/themes/twentytwentyone/assets/sass/06-components/footer.scss

@@ -31,6 +31,7 @@
 		font-size: var(--branding--title--font-size);
 	}
 
+	.privacy-policy,
 	.powered-by {
 		margin-top: calc(0.5 * var(--global--spacing-vertical));
 	}
@@ -39,10 +40,19 @@
 		display: flex;
 		align-items: center;
 
+		.site-name {
+			margin-right: calc(0.5 * var(--global--spacing-vertical));
+		}
+
+		.privacy-policy,
 		.powered-by {
 			margin-top: initial;
 			margin-left: auto;
 		}
+
+		.privacy-policy + .powered-by {
+			margin-left: calc(0.5 * var(--global--spacing-vertical));
+		}
 	}
 
 	a {

src/wp-content/themes/twentytwentyone/footer.php

@@ -53,6 +53,13 @@
 					<?php endif; ?>
 				<?php endif; ?>
 			</div><!-- .site-name -->
+
+			<?php
+			if ( function_exists( 'the_privacy_policy_link' ) ) {
+				the_privacy_policy_link( '<div class="privacy-policy">', '</div>' );
+			}
+			?>
+
 			<div class="powered-by">
 				<?php
 				printf(

src/wp-content/themes/twentytwentyone/style-rtl.css

@@ -3975,6 +3975,7 @@ table.wp-calendar-table caption {
 	font-size: var(--branding--title--font-size);
 }
 
+.site-footer > .site-info .privacy-policy,
 .site-footer > .site-info .powered-by {
 	margin-top: calc(0.5 * var(--global--spacing-vertical));
 }
@@ -3985,10 +3986,19 @@ table.wp-calendar-table caption {
 		align-items: center;
 	}
 
+	.site-footer > .site-info .site-name {
+		margin-left: calc(0.5 * var(--global--spacing-vertical));
+	}
+
+	.site-footer > .site-info .privacy-policy,
 	.site-footer > .site-info .powered-by {
 		margin-top: initial;
 		margin-right: auto;
 	}
+
+	.site-footer > .site-info .privacy-policy + .powered-by {
+		margin-right: calc(0.5 * var(--global--spacing-vertical));
+	}
 }
 
 .site-footer > .site-info a {

src/wp-content/themes/twentytwentyone/style.css

@@ -3995,6 +3995,7 @@ table.wp-calendar-table caption {
 	font-size: var(--branding--title--font-size);
 }
 
+.site-footer > .site-info .privacy-policy,
 .site-footer > .site-info .powered-by {
 	margin-top: calc(0.5 * var(--global--spacing-vertical));
 }
@@ -4005,10 +4006,19 @@ table.wp-calendar-table caption {
 		align-items: center;
 	}
 
+	.site-footer > .site-info .site-name {
+		margin-right: calc(0.5 * var(--global--spacing-vertical));
+	}
+
+	.site-footer > .site-info .privacy-policy,
 	.site-footer > .site-info .powered-by {
 		margin-top: initial;
 		margin-left: auto;
 	}
+
+	.site-footer > .site-info .privacy-policy + .powered-by {
+		margin-left: calc(0.5 * var(--global--spacing-vertical));
+	}
 }
 
 .site-footer > .site-info a {