Update links in learning section

[speryt]

As discussed in #89 updating broken/incorrect links on the website is one of the tasks to updated the website and bring it back to life. As a part of this also it's good to put everything alphabetically as mentioned in #9 .

[speryt]

It'll be good to add in the feature some section not just about learning materials, but also some more targeted steps towards beginner learners, because currently it's very difficult to find good starting material in the sea of links.

[speryt]

@victor-onofre could you please assign this issue to me?

[speryt]

@victor-onofre , @MaldoAlberto , I've ventured a bit outside of a learning section into https://www.qosf.org/project_list/ and my immediate question is - why there is section Abandoned projects? What's the goal of it? Should it be kept?

[victor-onofre]

I think it is a good way to keep track of unsuccessful projects. The information could be used to understand why a project is abandoned and if you want to build something similar, don't make the same mistakes

[speryt]

Ok, fair point.
So what deadline for considering project abandoned should be? I'd say 1 year should be good enough to begin with.