Add a page explaining the sensitive content filtering approaches

[dhruvkb]

Problem

The content safety wall #2462 shows different text based on different values of the sensitivity field provided by the API #2549.

Description

These differences in text can be subtle and may not immediately make clear to the user why a particular media has been flagged as sensitive. It would be helpful to have a page explaining the different factors considering when flagging a media item.

Essentially it would be mapping of keys in the sensitivity field in the API response to explanatory text that can be linked to from the content safety wall if the user needs more information about our process.

[zackkrida]

I'll handle the copywriting aspect of this page!

[sarayourfriend]

Here is my early draft of this text: https://docs.google.com/document/d/1gZ8blFT96cMyMomHuPUS-_LqK9v9GRCChG0Y9b6-EBQ/edit?usp=sharing

Please note that this is a VERY rough draft and is in no way a concrete representation of the final form of this documentation. Please share feedback here. I've added individual maintainers as editors to the document.

[dhruvkb]

@sarayourfriend should we mark this as blocked because we are awaiting input from another team for the final text?

[sarayourfriend]

Yes, good call.

For posterity, we're blocked waiting for a review from legal advisors to confirm the text is copacetic.

[AetherUnbound]

I believe we've got confirmation on the wording and can move ahead with converting this into a page on our frontend!