Profile template meta tweaks

[jonoaldersonwp]

• Change the <title> content to: {{Full Name}} ({{Username}}) - WordPress user profile | WordPress.org. E.g., Joost de Valk (joostdevalk) - WordPress user profile | WordPress.org.

• Add and populate a meta description tag with the (sanitized) content of the Bio field, up to 160 characters (cutting off gracefully with an ellipses character).

• Add and populate open graph tags as follows:

<meta property="og:type" content="profile" />
<meta property="og:title" content="{{Full Name}} - WordPress user profile" />
<meta property="og:description" content="{{Meta description}}" />
<meta property="og:url" content="{{URL}}" />
<meta property="og:site_name" content="WordPress" />
<meta property="og:image" content="{{Gravatar Large Image}}" />
<meta property="profile:username" content="{{Username}}" />

[tellyworth]

attachment:4277.diff​ implements @jonoaldersonwp's suggestions with one or two minor changes. Mainly, the bio is trimmed to 25 words rather than 160 chars.

@coffee2code does that look reasonable to you?

[coffee2code]

Ah yeah, I believe I actually have just about everything for this and most of #4280, which I worked on in tandem. I'll check if they need a refresh and get them committed shortly.