Add mention of bunx --bun to README (#2114)

* readme(bunx): add info about `bun --bun x`

* chore(formatting): add extension for formatting markdown to avoid a bunch of diffs

* chore(formatting): fix JS formatting in README

.prettierrc

@@ -2,5 +2,13 @@
   "arrowParens": "avoid",
   "printWidth": 120,
   "trailingComma": "all",
-  "useTabs": false
+  "useTabs": false,
+  "overrides": [
+    {
+      "files": "README.md",
+      "options": {
+        "printWidth": 80
+      }
+    }
+  ]
 }