Improving documentation on Devfile and initial development guide

[cdrage]

/kind documentation

What mistake did you find / what is missing in the documentation?

Notes with regards to improvements to documentation:

• Have a quick start guide that will go into a more complex guide, after the quickstart guide, go to how to use Devfile. #5682
• How Devfile actually works with odo with deployment / dev. When you use odo dev, what commands are actually ran? Same with odo deploy?  #5691
• more examples than just nodejs #5746

( # 1 problem for organic growth is to get people to hit the pages of odo, need keywords and language / framework tutorials. Simple tutorials that will explain how to deploy your favourite application. Ex: use odo init, select ex. python, then odo dev, and show what files to edit + see it reload.)

What is the relevance of it?

Missing documentation for the initial user.