Updating the docs

[Magalame]

Hi again!

I found the installation docs to be somewhat incomplete, notably regarding sundials, glpk
Maybe include a brief explanation of how to include hmatrix in a stack project since most newcomers probably rely on this tool, and might still need help.

I think that updating the tutorial/having a markdown version would also go a very long way

I'd like to know how do you feel about/if you have any advice or project started before I start working on a PR?

[idontgetoutmuch]

That would be great :) I would be very happy with a PR to improve this.

[Magalame]

Great! Do you have any particular advice or partial work I could draw from?

[idontgetoutmuch]

Can we close this?

[Magalame]

If you don't mind, I'd like to keep it open, I still have some PRs in mind :)