Add canonical urls to articles and snippets

Author: rossta

app/content/layouts/article.html.erb

@@ -9,7 +9,8 @@
      },
      twitter: {
        card: "summary"
-     }
+     },
+     canonical: url_for(only_path: false, overwrite_params: nil)
    ) %>
 <%= render "application/skip_to_content" %>
 <%= render_layout "application" do %>

app/views/share/snippets/show.html.erb

@@ -7,7 +7,8 @@
      },
      twitter: {
        card: @snippet.screenshot.attached? ? "summary_large_image" : "summary"
-     }
+     },
+     canonical: share_snippet_url(@snippet)
    ) %>
 
 <%= render Pages::Header.new(title: "Share: Snippet") %>

config/initializers/meta_tags.rb

@@ -46,4 +46,8 @@
   # config.property_tags.push(
   #   'x-hearthstone:deck',
   # )
+
+  # John Mueller's suggestion is to avoid mixing canonical with noindex
+  # https://github.com/kpumuk/meta-tags?tab=readme-ov-file#canonical-url
+  config.skip_canonical_links_on_noindex = true
 end