Improve Sample Apps section - Add a showcase page

[ajeetraina]

Right now, the Sample app section looks a bit old https://github.com/collabnix/dockerlabs#%EF%B8%8F-sample-app
It would be great if we can create a showcase page with tables highlighting thumbnails for each of these projects.

[premkirank]

@ajeetraina if this issue is still open, I would like to work on this. Can you assign this to me and provide a sample of what you have in mind if possible?

[ajeetraina]

@premkirank You are most welcome to bring up ideas and PRS.