Update metadata throughout the app

[dodgees]

Let's get those sweet SEO points.
Some ideas, update meta description, add a canonical link with relevant earner/agency name, other page meta data that I haven't looked into yet :)

Pages: Agency detail page, Employee detail page, Home page (for meta data)

[dodgees]

Canonical link, page title, and pretty URLs done. Still could use meta description along with meta tags that make pretty links when shared

[dodgees]

Resolved. May still use an ogimage at some point, but will revisit later