Merge branch 'mastoapi-login-and-config-fixes' into 'develop'

BREAKING_CHANGES.md

src/boot/after_store.js

src/components/post_status_form/post_status_form.js

src/components/post_status_form/post_status_form.vue

src/components/settings/settings.vue

src/components/user_settings/user_settings.js

src/modules/instance.js

src/services/api/api.service.js

.../backend_interactor_service/backend_interactor_service.js

src/services/entity_normalizer/entity_normalizer.service.js

static/config.json