use markdown only instead of ascidoc

[MalloZup]

I think that we don't need the github.io page really and the documentation would be simpler if we use only markdown ( is more accessible).

Once we have the markdown we could think to have diff section like
Readme.md
00_getting_started.md
01_advanced_stuff.md
02_examples.md

So the readme can more easy to navigate

[MalloZup]

@dincamihai @meaksh @brejoc any thoughts about this?

imho markdown is more easy then asciidoc. I could not even create a table of contents in ascidoc .. 😿
The other question is, do we need really the web-page created from asciidoc? i mean if we have a good markdown readme, i don't think we need the web-page 🤔