Fix external link badge display for tools hosted under the same domain

[dzole0311]

Related Ticket: #1187

Description of Changes

After discussing with @hanbyul-here during pod week, we identified two potential solutions:

1. Introduce an isExternalLink prop in the .mdx configuration files for each story, or,
2. Add logic in the card component to dynamically check the domain of the link and decide whether it is external

Option 2 requires less configuration for developers/users of VEDA instances, but it's not easy to test locally especially if we want more fine-grained control over future integration tests. So the implementation here goes for Option 1.

More context: https://developmentseed.slack.com/archives/C063GD0NYP8/p1728407361439379

• Add a new isLinkExternal prop that can be passed to the story as a configuration
• The existing check for http/https (/^https?:\/\//) remains in place as a fallback if the new prop is not present

Notes & Questions About Changes

Validation / Testing

• Use the new isLinkExternal prop in some of the stories and validate that it shows/hides the "External Link" badge in the UI
• Remove the isLinkExternal prop that you added and see if the UI still behaves as expected (e.g if the link you added in the story .mdx file has https, it will be marked as External Link in the UI cards)
• Click around the UI cards and verify that the links work as expected

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