grep -rl '# Copyright © .* Pleroma' * | xargs sed -i 's;Copyright © .* Pleroma .*;Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>;'

Standardize base url for uploads

See merge request !3246

ChatMessages: Fix pagination headers.

See merge request !3250

They used to contain the path parameter `id` as query param,
which would break the link.

.formatter.exs: Format optional migrations

See merge request !3249

(There are no changes to optional migrations since they were manually
formatted in !3207)

Add some information about setting up a development environment

Closes #1904

See merge request !3207

* I cretaed a folder 'development'
* I split up the file dev.md into three parts and moved it to this folder
  * index.md
  * authentication_authorization.md
  * mrf.md
* I also moved ap_extensions.md
* I created a new file setting_up_pleroma_dev.md

Now we should have a correct base URL for S3 hosted objects throughout the codebase.

Fix URL generated for backup files, try to create a source of truth we can reuse throughout the codebase

ActivtityPub Test: Add example for guppe actor

See merge request !3243

Automatically confirm logged-in users

See merge request !3234

Create dir for EmojiStealPolicy automatically

See merge request !3218

Backups: render ID in API

See merge request !3245

Cleanup Pleroma.Upload proxy opts

See merge request !3236

Object: Rework how Object.normalize works

See merge request !3229

AdminAPI: return user email

See merge request !3240

Upstream external emoji support

See merge request !3238

Fix proxy and mediaproxy description.exs

See merge request !3219

URI.encode custom emojis

Closes #2381

See merge request !3235

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