tpl/tplimpl: Add .Site.Title to embedded opengraph template

[sean-au]

Added .Site.Title, to go alongside the existing .Site.Params.Title lookup for og:site_name.

.Site.Title has been given preference.

.Site.Title is specified in the hugo docs as the place to record the sites name https://gohugo.io/getting-started/configuration/#title

Its also configured by default when running "hugo new site"

# config.toml
baseURL = "http://example.org/"
languageCode = "en-us"
title = "My New Hugo Site"

[bep]

This looks good, but could you run mage generate to rebuild the template "cache".

[sean-au]

That should work

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