Add user-facing explainer metrics (#2211)
Add user-facing explainer metrics (#2211)

* Add user-facing explainer

Added a user-facing explainer at the top of the doc as we link to this file from the UI.

Moved all content that was already in the doc to below the divider with the heading 'How it works'

* Update _docs/app-metrics.md

Co-authored-by: Samuel Hawksby-Robinson <c16aab9fe3288df0fb8fc1d24990a300b6b8f299@samyoul.com>

* Update _docs/app-metrics.md

Co-authored-by: Samuel Hawksby-Robinson <c16aab9fe3288df0fb8fc1d24990a300b6b8f299@samyoul.com>

* Update _docs/app-metrics.md

Co-authored-by: Samuel Hawksby-Robinson <c16aab9fe3288df0fb8fc1d24990a300b6b8f299@samyoul.com>

* More text edits based on comments

Session key > Batch ID
Regular Chat key > Chat key

* Remove spaces

* Update app-metrics.md

- Remove 'anonymous' claim
- Correct that we believe the data cannot be linked back to you

* Add criteria to include data in validator rules

* Update app-metrics.md

* Replace anonymous from intro

Removing anonymous reference as discussed on Discord. 'Anonymous' is a claim we logically can't make in spite of best effort and current insights; we are not delivering proof. In addition there is the threat model of a phone ending in the wrong hands with the collected data, albeit temporarily stored locally, falling in the wrong hands.

We do want to communicate that the approach is "as privacy preserving as we could possibly make it without it being useless"

anonymous > privacy-preserving
over Waku > over Status' peer-to-peer network (Waku)

* Update app-metrics.md

- Add warning at top
- Update text at the bottom of 'what will never be shared'
- Remove 'Time since last data message sent'
- Changed 'Time since last session' to 'Time since last batch sent' @shivekkhurana can you confirm this is accurate?

* Update app-metrics.md

Replace instance of 'anonymous' in `How it works` with 'end-to-end encrypted'

* Update app-metrics.md

Added: "Status will never use these data for profit."

* Edit to Transmission and deletion

Added that data is deleted locally if not transmitted after 7 days

@Samyoul can you take a look to see if there are more details to add to this section?

* Update app-metrics.md

Remove privacy-preserving as claim in intro and end-to-end encryption to reduce perception of privacy

* Added info banner

Added info note to explicitly state that usage data service is not included in release or nightly builds

* Added links to related PRs

These PRs include a lot of additional information that will be useful for a future dev, also probably me too.

Co-authored-by: Samuel Hawksby-Robinson <c16aab9fe3288df0fb8fc1d24990a300b6b8f299@samyoul.com>
status-im/status-go,status-im/status-go,status-im/status-go