fix: use Octicon from deprecated

Author: reggi

src/components/page-footer.js

@@ -1,5 +1,6 @@
 import React from 'react'
-import {Box, Octicon, Avatar, Text} from '@primer/react'
+import {Box, Avatar, Text} from '@primer/react'
+import {Octicon} from '@primer/react/deprecated'
 import {Tooltip} from '@primer/react/next'
 import {PencilIcon} from '@primer/octicons-react'
 import Link from './link'

src/mdx/code.js

@@ -1,5 +1,6 @@
 import React from 'react'
-import {Box, Text, Button, Octicon, themeGet} from '@primer/react'
+import {Box, Text, Button, themeGet} from '@primer/react'
+import {Octicon} from '@primer/react/deprecated'
 import {Highlight, themes, Prism} from 'prism-react-renderer'
 import styled from 'styled-components'
 import {CheckIcon, CopyIcon} from '@primer/octicons-react'

src/mdx/components.js

@@ -1,5 +1,6 @@
 import React from 'react'
-import {Box, Heading, themeGet, Octicon} from '@primer/react'
+import {Box, Heading, themeGet} from '@primer/react'
+import {Octicon} from '@primer/react/deprecated'
 import styled from 'styled-components'
 import {variant as styledVariant} from 'styled-system'
 import {LinkIcon} from '@primer/octicons-react'