feat: support relative paths in svelte components and update test project to svelte 5

[ThisIsFayad]

This PR adds and enhances multiple things:

1. Adds support for relative paths in svelte components
   Now you are able to do the following in your mdsvex files:

<SampleComponent path="./my-image.png" />

2. Migrates the test project to svelte 5
   Fix breaking changes when running test project and update it to the latest version
3. Update README
   To reflect changes and polish for clearer installation and configuration instructions

Also, I would have added a LICENSE but I will leave that to you.

Resolves #3

[mattjennings]

wow thanks a lot for doing this! I think my only concern is this now this checks every prop for a relative path string, but someone could have a prop="./abc" that isn't an asset.

While unlikely, it would probably handle most cases if we also checked that the path ends with a file extension.

[ThisIsFayad]

I agree, I will look more into it and update it so it checks for the file extension too.

[ThisIsFayad]

I have updated the regex so it only matches paths that have a file extension, and while I was at it, I added support for aliases and outside folders. So now you can do the following:

<SampleComponent path="./my-image.png" />
<SampleComponent path="../images/another-folder-image.png" />
<SampleComponent path="$lib/images/lib-image.png" />

I am not the best at regex, so I would appreciate it if you take a second look at it. You can check them here:
Component Regex
Path Regex

I added tests for this and updated the README to reflect it.

[ThisIsFayad]

I have updated the Regex to allow for query params for tools such as vite-imagetools, so you can do the following:

<SampleComponent path="./my-image.png?format=webp" />

Here are the new regex expressions:
Component Regex
Path Regex

[mattjennings]

Amazing! Thanks a ton for the work on this. Admittedly I don't use mdsvex at all anymore but these features have been requested a few times, so I'm super appreciative you took the time to do it. Will release this today!

[ThisIsFayad]

Thanks!

One last thing, I know there is a license in the package.json but can we add one to the project repo, so it is easier for people to see it.