Migrate oauth tokens module to pinia store

src/modules/index.js

@@ -7,7 +7,6 @@ import config from './config.js'
 import profileConfig from './profileConfig.js'
 import adminSettings from './adminSettings.js'
 import authFlow from './auth_flow.js'
-import oauthTokens from './oauth_tokens.js'
 import drafts from './drafts.js'
 import chats from './chats.js'
 
@@ -21,7 +20,6 @@ export default {
   profileConfig,
   adminSettings,
   authFlow,
-  oauthTokens,
   drafts,
   chats
 }