[DOCS]: Add images for the visualization of the development process

[ruslankonev]

trafficstars

It would be nice to make some screenshots for Getting Starred docs. This would reduce the process of entering into the development of applications for ElementaryOS! And make more manuals — section/folder on GitHub or make different community repository, such example — https://github.com/nuxt & https://github.com/nuxt-community. Or a Awesome-ElementaryOS for OS-app development.

[peteruithoven]

Could you point to the actual documentation example, instead of github organizations? I found one visualization on: https://nuxtjs.org/guide It does have a nice index on the left.