Revert "Add support for top-level "sh" auth"

This reverts commit c493d65.

Author: leo

src/now.js

@@ -183,11 +183,6 @@ const main = async (argv_) => {
     }
   }
 
-  // Support top-level "sh" config
-  if (config && !config.sh) {
-    config.sh = config;
-  }
-
   let authConfigExists
 
   try {
@@ -221,11 +216,6 @@ const main = async (argv_) => {
       return 1;
     }
 
-    // Support top-level "sh" auth
-    if (!Array.isArray(authConfig.credentials) && authConfig.token) {
-      authConfig.credentials = [{ provider: 'sh', token: authConfig.token }];
-    }
-
     if (!Array.isArray(authConfig.credentials)) {
       console.error(
         error(