Allow relative URLs in bottom bar

[CosmicToast]

Consider an index.gmi that exposes some subdirectories but not others (e.g a ./hidden link that's not in index.gmi).
(There are many such use-cases, such as leaving the door open to people with the link, or simply not wanting to have a directory exposed in the index, since most viewers will not care about it.)

In the current scenario, as far as I can tell, the only way to navigate to it is to type out the entire current prefix followed by /hidden, but the current path may be long.
It would be nice if one could type ./hidden in the bottom bar, and (if the current url is a real one) the resolution happens internally.

I notice that amfora already has this for link handling (followLink), but URL() specifically wants absolute paths.

There's a couple of ways I can think of implementing this, but the calls are kind of all over the place.
Could this feature be added for convenience's sake?
I think a "good enough" heuristic should be if the first character of the bottom bar is "." - this way the method can also take care of handling ".." (but also further, things like "../otherdir").

[makew0rld]

This is a good feature, and should be easy to implement. I've thought about how I want this myself, just never made an issue for it. This will be added, thanks! Likely by v1.6.0.

[CosmicToast]

Please poke me whenever the commit is made (or you decide what path you want to take towards implementing it, so I can give it a shot in a way that doesn't conflict with how you want the project to work (all variants I can think of would change multiple parts of the project)).
I'll rebuild amfora (my bin bucket is HEAD-only) and that should give users a binary to test even pre-release :)

[makew0rld]

Basically change these lines to support any path starting with a dot, and use ResolveReference from the net/url package to get an absolute URL to provide to URL. You could also turn that into a function, but I suspect adding this will not increase the LOC in that section, so you can just leave it there.

Feel free to take a shot!

[CosmicToast]

CC - done
was a bit sick so I didn't notice the comment (on how you wanted it done) until now :)
net +/- is actually in the - (6+/15-)