Add page meta tags

[mutantsan]

We need a way to add meta tags

[Alex-Pavlyuk]

As a user I want to edit all metatags in one field, because usually I know what to do, and what to create new metatags on my own If I need

[mutantsan]

Client want to add a meta tag to the newly created page. We already have a "save" button, that opens the modal window, where user can provide some metadata (such as title, URL, full screen toggle, publish state).

Theoretically, this could be a place to add an extra textarea, where the user can add the HTML for meta tags. Because clients already knows which meta tags they want.