Improve "report" feature

[vrde]

From #7 (comment), by @vecna:

"report" is the action we want to trigger, a bug report or a will report ? if is a bug, is about the parsing, if is about the parsing is due to the lack of language support, so we've to drive the user on the community page and tell us how the "Public" looks like in their language. if is a report, we've to keep track of the postId, so we can interact with the system (or even automatize) a post removal

Right now the report is just a mailto:support@tracking.exposed. An idea is to improve the report feature adding a dialog asking the user to share some info with us.

[vecna]

ideally, to receive a certain level of automation, for every sent post we can generate a random number, that random number can be sent to us via event and used in an API call like POST https://facebook.tracking.exposed/remove/$userId/impression

{
     "randomImpressionNumber": 34242343,
     "signature": ...
}

The signature is computed with private key of hash(randomImpressionNumber + userId),

Backend side, we check such consistency, hooking via API we automatize the removal.
( The backend operations are still to be defined: do we remove the users impression, but not the HTML? )