Revise bandwidth reduction page with cellular measurements

[kb2ma]

Emphasize bandwidth used per feature, and simplify. Also add the effect of NetworkManager connectivity check.

[kb2ma]

@vipulgupta2048 , I'm happy for any comments but most interested in the overall structure of the revision at this point. I don't want to start tweaking before we're happy with the approach. Overall I tried to focus on actual bandwidth usage because I think that's most relevant.

[kb2ma]

@vipulgupta2048 , tightened up the presentation format. I responded and resolved some comments. The others remain to implement. Are you happy with the overall flow now?

[vipulgupta2048]

I am satisfied with my care the overall flow @kb2ma Go for it.

[kb2ma]

Addressed all comments and refined text. Ready for review, @vipulgupta2048 .

[kb2ma]

@rosswesleyporter , I'd appreciate your review here. See this file for a decent rendering.

[rosswesleyporter]

First, this is great! Very useful. Very clear.

Suggest emphasizing the Supervisor version and the balenaOS version. From reading, it's not immediately obvious that there is a substantial benefit to using 2.107.10 & 14.4.4 or later. But if I understand correctly there is a big benefit. Could add a sentence above the table. Or perhaps put the versions in the table itself.

Above the table you may want to mention that the settings are reversible. For instance, the VPN can be turned back on. For some customers, it may sound scary to turn off the VPN.

This may not be important enough to include, but turning off Cloudlink turns off the ability to HUP.

In Device Logging, perhaps change "or balena system" to "or the balena system"

Again, this is great!

[kb2ma]

Glad to hear the doc is clear and useful, @rosswesleyporter . I can emphasize cautions and required versions. Speaking of versions, I'm going to move this PR back to draft until there is a more recent release for RPi4. I manually added a fix that's in a later version of balenaOS than the version currently in the doc, 2.107.10.

[kb2ma]

Thanks for the improvements to the Side Effects section, @dfunckt . I agree that many of them read better and incorporated in the latest commit.

I did continue to start the explanatory text as a new sentence. I also added a colon ":" after the bold heading. I wanted the words in bold to refer to the feature back up to the table. I think trying to make a sentence begin with the heading deflects from that intent.

[kb2ma]

When merge this PR, must follow up with user for #2126. Also must review patterns related to bandwidth.

[kb2ma]

@vipulgupta2048 , this PR is ready for your detailed review.

[vipulgupta2048]

Looking fine-o-fine. I just pushed a new commit containing some of the changes I felt that could be helpful. The only review I make is to reduce commits down to 1 or 2 ideally. Since most of the changes are about improving the content of the same only.
Feel free to self-certify after that

[kb2ma]

@balena-ci I self-certify!