Page titles and meta tags aren't working

[sknep]

See empty <title> and <meta> tags here: view-source:https://uswds-11ty.pages.cloud.gov/

I suspect these liquid variables aren't correct for eleventy, maybe they're old jekyll ones we copied over?

https://github.com/cloud-gov/pages-uswds-11ty/blob/545a86341cb5f710d9190656fbf339e9ac066d18/_includes/meta.html#L19

[sknep]

Also make sure that the page titles postfix or prefix the site title. see: https://github.com/GSA-TTS/tts.gsa.gov/issues/262#issuecomment-2356303279