Update pricing url with ref and refAction params [GRO-282] (#24339)

## Description
In order to better attribute upgrade sources, we are adding two params -
`ref` and `refAction` to the existing pricing url.
The `ref` will be "Docs" and the `refAction` will be the particular docs
page from where the pricing url click is originated.

## Related issues or tickets
https://docker.atlassian.net/browse/GRO-282

## Reviews
@akristen You should see the new url params when hovering over or
clicking any of the updated pricing urls

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

---------

Co-authored-by: Alexa Kristensen <81787716+akristen@users.noreply.github.com>

README.md

@@ -21,7 +21,7 @@ We’d love to hear your feedback! To submit feedback:
 
 To get community support, use the [Docker Community Slack](https://dockr.ly/comm-slack). Personalized support is available
 through the Docker Pro, Team, and Business subscriptions. See [Docker
-Pricing](https://www.docker.com/pricing) for details.
+Pricing](https://www.docker.com/pricing?ref=Docs&refAction=DocsReadme) for details.
 
 If you have an idea for a new feature or behavior change in a specific aspect of
 Docker or have found a product bug, file an issue in the project's