alphabetize polaris in the list

Author: yurm04

packages/presets/src/index.js

@@ -10,5 +10,5 @@ export { default as tosh } from '@theme-ui/preset-tosh'
 
 export { default as bootstrap } from '@theme-ui/preset-bootstrap'
 export { default as bulma } from '@theme-ui/preset-bulma'
-export { default as tailwind } from '@theme-ui/preset-tailwind'
 export { default as polaris } from '@theme-ui/preset-polaris'
+export { default as tailwind } from '@theme-ui/preset-tailwind'