Initial AD port

themes/after-dark/docs/content/feature/referrer-policy.md

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+title = "Referrer Policy"
+description = "Specify how much info is passed to external links."
+categories = ["security"]
+tags = ["privacy", "security", "SEO", "metadata"]
+features = ["related content", "code highlighter", "snippets"]
+[[copyright]]
+  owner = "Josh Habdas"
+  date = "2019"
+  license = "agpl-3.0-or-later"
++++
+
+After Dark adds a {{< external href="https://w3c.github.io/webappsec-referrer-policy/" text="Referrer Policy" />}} to improve site security and increase visitor privacy beyond browser defaults using a simple site-wide policy.
+
+Adjust the site-wide default of `same-origin` from {{< external href="https://gohugo.io/getting-started/configuration/" text="Site Configuration" />}}:
+
+```toml
+[params.seo]
+  referrer = "same-origin"
+```
+
+Relax the security policy by:
+
+- Adjusting the site-wide default;
+- Using the `referrerpolicy` attribute of the [External Shortcode](/shortcode/external);
+- Using a {{< external href="https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-delivery-nested" text="nested browsing context" />}} to adjust contextually.
+
+See {{< external href="https://w3c.github.io/webappsec-referrer-policy/" text="Referrer Policy on W3C" />}} for a list of possible values.