Merge branch 'features/favicons' into 'develop'

CHANGELOG.md

config/config.exs

config/description.exs

config/test.exs

docs/API/differences_in_mastoapi_responses.md

docs/configuration/cheatsheet.md

lib/pleroma/instances/instance.ex

lib/pleroma/web/api_spec/schemas/account.ex

lib/pleroma/web/mastodon_api/views/account_view.ex

.../repo/migrations/20200707112859_instances_add_favicon.exs

test/fixtures/tesla_mock/https___osada.macgirvin.com.html

test/support/http_request_mock.ex

test/web/mastodon_api/views/account_view_test.exs