Change cosmos fixtures structure and vite plugin logic

[oldbear26]

There are a couple of reasons that are causing #96, which only happens in production while working normally in development:

1. The reliance on a Vite plugin to to read the content of the code. This won't work in production because it's a static site, there is no Vite server, and also because the code files get bundled so there is nothing to read.
2. The reliance on import.meta.url to get the name of the file. This also doesn't work for the same reason.

The solution I am proposing here is to move all the fixtures examples to the public directory so that they can be served by the server, and replacing the Vite server plugin with a transformer that replaces the import.meta.url with the fixture name. Not really sure whether this is the best solution, partially because I am a little confused about the usage of this code previewer. Feel free to point out if there is a better solution.

/claim #96

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[oldbear26]

Hello @seveibar. Can you take a look at this?