chore(xo-server): remove useless entry point

Introduced by 254558e9d

Due to ESM, it's no longer easy to alter `DEBUG` before all instances of `debug` are loaded, which makes it useless.

packages/xo-server/index.mjs

@@ -1,11 +0,0 @@
-'use strict'
-
-// ===================================================================
-
-// Enable xo logs by default.
-if (process.env.DEBUG === undefined) {
-  process.env.DEBUG = 'app-conf,xo:*,-xo:api'
-}
-
-// Import the real main module.
-export { default } from './dist/index.mjs'

packages/xo-server/src/cli.mjs

@@ -6,7 +6,7 @@ import execPromise from 'exec-promise'
 import { catchGlobalErrors } from '@xen-orchestra/log/configure.js'
 import { createLogger } from '@xen-orchestra/log'
 
-import boostrap from '../index.mjs'
+import main from './index.mjs'
 
 // ===================================================================
 
@@ -33,4 +33,4 @@ global.Promise = Bluebird
 
 catchGlobalErrors(createLogger('xo:xo-server'))
 
-execPromise(boostrap)
+execPromise(main)