Update CONTRIBUTING.md

[playfulFence]

closes #1225

[MabezDev]

Looking pretty good from my perspective, but I think we should revert inlining the links.

[SergioGasquez]

Looks good overall, just left a few comments. Regarding the -ing suggestions, they are just for consistency with other headers, feel free to change it the other way.

[SergioGasquez]

These two items are not working or not present, not sure if we need a toc, when viewing a readme in gh you already have the outline:

[playfulFence]

IMO:

1. having Quick Navigation part in text is a bit more reader-friendly and beautiful 😄
2. "Outline" function is rarely used, from my experience

However, if you insist and think it's a critical point - will revert it back

[jessebraham]

(Sorry I'm reading some material relating to contributing guides, will do a proper review within the next few business days)

[jessebraham]

Sorry for not getting to this, had a lot on my plate.

I think we should meet as a team to discuss how best to move forward with this. I think there is a fair bit of information that should ultimately be included in CONTRBUTING.md (and/or other documents), so it'd be nice to come up with a bit of a game plan first.

CC @MabezDev

[MabezDev]

Now that we have the xtask, I think we should also document some do's and don't of how to use it. For example we should state that all xtask commands should be run from the root of the project, not in a sub project.

[playfulFence]

@MabezDev, agree!
Maybe let's discuss this topic on a next meeting(/when most of us won't have a vacation 😄)? Just to put this matter to rest.

cc: @jessebraham (as you've had some thoughts and suggestions on this)

upd: Also worth mentioning is the update to the HIL tests in case related API was changed