Added a Vimeo EnableDNT privacy option to the Hugo config. This will enable the Vimeo 'Do Not Track' flag when either Vimeo shortcode tempalte options are used. When enabled, it will force the Vimeo player to be blocked from tracking any session data, including all cookies and stats.
Fixes #7700
The current full set of options for GA is now:
```toml
[privacy]
[privacy.googleAnalytics]
disable = false
respectDoNotTrack = true
anonymizeIP = true
useSessionStorage = true
```
Fixes #4775
