Add snippet IID to snippet page titles

app/views/projects/snippets/edit.html.haml

-- page_title "Edit", @snippet.title, "Snippets"
+- page_title "Edit", "#{@snippet.title} (#{@snippet.to_reference})", "Snippets"
 
 %h3.page-title
   Edit Snippet

app/views/projects/snippets/show.html.haml

-- page_title @snippet.title, "Snippets"
+- page_title "#{@snippet.title} (#{@snippet.to_reference})", "Snippets"
 
 = render 'shared/snippets/header'
 

app/views/snippets/edit.html.haml

-- page_title "Edit", @snippet.title, "Snippets"
+- page_title "Edit", "#{@snippet.title} (#{@snippet.to_reference})", "Snippets"
 %h3.page-title
   Edit Snippet
 %hr

app/views/snippets/show.html.haml

-- page_title @snippet.title, "Snippets"
+- page_title "#{@snippet.title} (#{@snippet.to_reference})", "Snippets"
 
 = render 'shared/snippets/header'