External links should have an arrow

[yamcodes]

In modern web dev, we tend to see a "top right" arrow next to external links:

Implement a component or an integrated way to achieve this within our Fumadocs/Next.js stack in the www app.
This should only apply to underlined links/buttons, not to actual distinct (primary/secondary/etc.) buttons. Basically only to things that look like a part of text.

The only exceptions are:

1. Internal links (links that route you from within the Next.js app)
2. External links that are actually internal (in other words have the same domain as the website)

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