Fix link to repository and small formatting fixes

[CGMossa]

Hello! Nice collection of packages.

I was just taking a look, and noticed that

• a link to the repository is broken
• syntax highlighting in the READMEs were missing

Thus, here is a small and quick PR

[LCrossman]

Hi @CGMossa thanks v much, this looks great!!
The thing about the link to the crates.io was that I in fact merged the microSeqIO into the main microBioRust to make import paths shorter and create a flatter structure. But we could review that structure again if there's broader interest in keeping it separate or better modularity?
In the current case could you mind splitting this PR into 2 - one for the crate/module restructure and one for the general improvements? Then I can merge the general improvements straightaway.

[CGMossa]

Sure. Just to make sure we understand each other. Do you know, that the link currently present leads nowhere?

[LCrossman]

Hi, Ah I get you now! Thanks, yes I yanked that microSeqIO so as to make a simpler structure.
microBioRust-microSeqIO v0.1.1 Yanked.
So let me accept your PR as it is :) & consider later the structure with IO.

[LCrossman]

Thanks