squashed identity proof updates (#10375)

...controllers/api/v1/accounts/identity_proofs_controller.rb

app/controllers/settings/identity_proofs_controller.rb

app/javascript/mastodon/actions/identity_proofs.js

...javascript/mastodon/features/account/components/header.js

...t/mastodon/features/account_timeline/components/header.js

.../features/account_timeline/containers/header_container.js

app/javascript/mastodon/features/account_timeline/index.js

app/javascript/mastodon/reducers/identity_proofs.js

app/javascript/mastodon/reducers/index.js

app/javascript/styles/mastodon/containers.scss

app/javascript/styles/mastodon/forms.scss

app/lib/proof_provider/keybase.rb

app/lib/proof_provider/keybase/config_serializer.rb

app/lib/proof_provider/keybase/verifier.rb

app/models/account_identity_proof.rb

app/serializers/rest/identity_proof_serializer.rb

app/views/settings/identity_proofs/new.html.haml

config/locales/en.yml

config/routes.rb

spec/controllers/settings/identity_proofs_controller_spec.rb