fix: relative link replacement

[BobbieGoede]

Resolves #94

This changes the relative link replacement, only image asset URLs are replaced/prefixed with the raw Github URL, while relative markdown URLs are simply replaced/prefixed with a normal (absolute) link to the branch tree.

Code is a bit messier with my changes 😅 happy to receive feedback.

[BobbieGoede]

Sorry it looks like there may be an edge case where this fails, checking if it's cache..

[BobbieGoede]

Oh, I ran into a separate related issue, worried it was my changes that did it 😂

On https://unjs.io/packages/changelogen see the link in the highlighted text, the replacement function replaced the URL string instead of the URL itself, I'll try and fix that as well 💪.

[BobbieGoede]

It seems like some images still don't render correctly, but I'm not entirely sure if it's caused by the URL replacement logic.

See https://unjs.io/packages/automd for example, the badges and the contributor graph are not shown, while they are on Github https://github.com/unjs/automd.

The PR should fix the referenced issue as well as the behavior described in my previous comment, I'll leave the image rendering issue for another time or person 😅

I see now that removing those is intentional, so all good!

[cpreston321]

@BobbieGoede changes look good, I must have missed since in the previous PR since I was trying to fix just relative images.

@pi0 The only thing should we unit test of the helper function to cover most cases?

[pi0]

Unit test would be nice! (also good for later refactors to move to an AST aware transform)

[BobbieGoede]

I just added very basic unit tests for this function and changed the ci file to run the tests, coverage only checks utils folder though.

[cpreston321]

Thanks @BobbieGoede looks great.

[BobbieGoede]

Unit test would be nice! (also good for later refactors to move to an AST aware transform)

I figured I would try my hand at a refactor using AST to replace the links as hinted at, I kept it on a separate branch here BobbieGoede#3.

No pressure to use those changes, it's primarily for me to get more experience using ASTs 😄