Set meta tag page title on publication nodes

[finnlewis]

@msayoung pointed out we need to set the page title meta tag

Tasks

• Make sure that the page title (meta tag) has the node title.
• (would be nice) Can we make the meta tag read "[node title] - [publication title]"

[finnlewis]

( Finn was wondering if we can add a token to find the publication title in the same way as the page title block )

[RyanFH257]

@rupertj to look at how this has been done for Guides

localgovdrupal/localgov_guides#132