Incorrect url generation for members in <a> hyperlink

This issue applies to both the CNCF and LFAI landscapes, and I believe this is the result of url-generation in this upsteam app.

## What happens?

The url in the `a` element for the members header is incorrect. On click the element functions as expected, but when opened in a new tab the link leads to a 404.

This happens in the [members page](https://landscape.cncf.io/members?category=platinum&grouping=category) when clicking the category link for silver/gold/platinum (CNCF) or associate/general/premier (LFAI) respectively. For clarity, here's a screen shot of the cncf page with the offending link highlighted in a red box:


The hyperlink element looks like this:

```
Platinum

```

The `href` part is wrong, and should redirect to `/card-mode` rather than `card`.

This seems like a very simple fix and I'd be happy to fix it myself, but I have absolutely no experience in NodeJS and have been unable to find exactly where in the code this has to be fixed. If someone can either fix this, or direct me to the file that needs to be edited, that'd be much appreciated.