Adding Medicare cardholders

[indexing]

• added Medicare cardholders to supported enrollment pathways table

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[github-actions]

Preview url: https://benefits-2253--cal-itp-previews.netlify.app

[indexing]

For the new Medicare cardholders row, I followed the path structure of the links to other enrollment pathways from the table.
[**Medicare cardholders**](/benefits/enrollment-pathways/medicare-cardholders)

However, it seems the links for the other enrollment pathways are broken on the live page. Click low-income as an example. I get a 404. https://github.com/cal-itp/benefits/tree/main/docs

The link is [**Low-income**](/benefits/enrollment-pathways/low-income) in the code.
The link in the published documentation is
https://github.com/cal-itp/benefits/blob/main/benefits/enrollment-pathways/low-income

The relative path looks correct, but do we need to add the full URL—including the subdomain—for the link?
https://docs.calitp.org/benefits/enrollment-pathways/low-income/

@thekaveman Something is not resolving correctly in the docs file structure.

[thekaveman]

@indexing that's just how the preview site works, unfortunately. The live site is working fine: https://docs.calitp.org/benefits/#supported-enrollment-pathways

It's because the live site is all under a sub-directory of the domain, e.g. docs.calitp.org/benefits/#supported-enrollment-pathways

But the preview site is at the top-level of the domain, e.g. benefits-2253--cal-itp-previews.netlify.app/#supported-enrollment-pathways

I don't know if its worth digging into more at this point. That's a shared preview site used by many repos in Cal-ITP. We may be able to change the way links are entered in our docs to resolve correctly no matter what, that could be something to look into... but would be a big refactor.