Move login to oauth.

This unifies Mastodon and Pleroma logins and makes it easier to implement SSO schemes.

src/boot/after_store.js

@@ -159,9 +159,11 @@ const afterStoreSetup = ({store, i18n}) => {
     .then((res) => res.json())
     .then((data) => {
       const metadata = data.metadata
-      store.dispatch('setInstanceOption', { name: 'mediaProxyAvailable', value: data.metadata.mediaProxy })
-      store.dispatch('setInstanceOption', { name: 'chatAvailable', value: data.metadata.chat })
-      store.dispatch('setInstanceOption', { name: 'gopherAvailable', value: data.metadata.gopher })
+
+      const features = metadata.features
+      store.dispatch('setInstanceOption', { name: 'mediaProxyAvailable', value: features.includes('media_proxy') })
+      store.dispatch('setInstanceOption', { name: 'chatAvailable', value: features.includes('chat') })
+      store.dispatch('setInstanceOption', { name: 'gopherAvailable', value: features.includes('gopher') })
 
       const suggestions = metadata.suggestions
       store.dispatch('setInstanceOption', { name: 'suggestionsEnabled', value: suggestions.enabled })