Also:
* remove share visibilities where the shareable is already deleted
* remove share visibilities where the user doesn't exist
* remove `created_at` and `updated_at` to make the table smaller

closes #6734

Remove parent author signature for relayables from the DB

add a card footer in gallery containing meta data and link to single post view

Use Hamlit to render Haml

Include a private key to the user data export archive

closes #6720

In order to allow a user to notify his contacts of his migration
with a trustworthy signature the old private key must be available
to the new pod where we import data.

Fix notification count change on contacts page

Fix style regression on contacts page from #6697

Improve interaction avatar alignment for SPV

Remove #publisher_photo_upload from haml

It seems like #publisher_photo_upload is relict of blueprint.
It was removed from CSS in 0c7d319f and
probably was unused even before. So remove it from publishers.

Adjust the SPV design

Only mark unread notifications as read otherwise, the UPDATE statement would update all the notifications...

closes #6711

Activate "Stream::Person returns the most recent posts" spec

closes #6710

[ci skip]

closes #6707