refactor: migrate 5chan to the community hooks API (#1073)

* refactor(community-api): migrate 5chan to community hooks

* fix(review): address PR feedback

* fix(review): preserve legacy board context fallbacks

* fix(review): address latest bot feedback

* fix(review): use communityAddress in edit menu privileges

src/components/settings-modal/account-settings/__tests__/account-settings.test.tsx

@@ -289,7 +289,7 @@ describe('AccountSettings', () => {
         name: 'Imported',
         author: { address: '0x999' },
         subscriptions: ['business.eth'],
-        subplebbits: {
+        communities: {
           'business.eth': { title: '/biz/' },
           'music-posting.bso': { title: '/mu/' },
         },