Rework First steps methodology

[edison23]

This PR presents the completely reworked First steps methodology. My goal was to make the guide work as a standalone series of articles (modules) that are independent on the video presentations in the original MID-301 First steps training (unlike the original 6-article First steps methodology we currently have in the Documentation). One of the reasons is that I believe it may be for many users more comfortable and beneficial to follow a textual guide rather than watching videos because following text guides supports the learning process better, I think. I used the original training as a foundation for the content in the First steps guide I have written.

I would hereby like to kindly ask for a review of my work here. I would be grateful for validation (or rejection for that matter) of the learning flow, the value for learners, and for pieces of advice on what can possibly be improved in that regard, as I find the flow and learning value the most important aspects of such a guide. However, I will be happy to hear any remarks, of course.

I am assigning this to you, @dejavix , since the original course is your work, but please feel free to delegate as you see fit; I am aware it is a lot of content and the time invenstment is substantial. Obviously, I count on the fact the review may take some time, that is completely fine.
I am tagging for visibility @licehammer and @jirihuf .

[edison23]

@licehammer : I am not sure I understand the reason for setting the mapping lifecycle state to draft . I feel I am missing something because according to what I know, a configuration item in draft is not used at all. I may have rewritten the sentence wrong but the original sentence of yours has the same meaning, I think.

(BTW, I hereby deeply apologize for moving and making changes to the file in the same commit in which the move was not picked up as a rename but as a delete & create.)