Remove circular dependencies

It still works but seems to make the build slow so removing.

See #81

src/components/Alert/Alert.tsx

@@ -1,7 +1,8 @@
 import type * as Polymorphic from '@radix-ui/react-polymorphic'
 import React, { FC, forwardRef } from 'react'
 import { CSS, StitchesVariants, styled } from 'stitches.config'
-import { Heading, Text } from '../'
+import { Heading } from '../Heading'
+import { Text } from '../Text'
 
 const DEFAULT_TAG = 'div'
 

src/components/List/ListItemText.tsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import { styled } from 'stitches.config'
-import { Box, Text } from '..'
+import { Box } from '../Box'
+import { Text } from '../Text'
 
 /**
  * ListItemText component

src/components/index.ts

@@ -23,3 +23,4 @@ export * from './Svg'
 export * from './Text'
 export * from './ThemeProvider'
 export * from './Tooltip'
+export * from './Spinner'