Temporarily revert Android commits in order to create a release of Slate focused solely on Android (#4256)

* Revert "Add DefaultEditable and AndroidEditable to exports (#4255)"

This reverts commit 5298e51f6e.

* Revert "Feature/android keyboard support (#4200)"

This reverts commit e03ce7c561.

site/examples/images.tsx

@@ -1,13 +1,13 @@
-import React, { useMemo, useState } from 'react'
+import React, { useState, useMemo } from 'react'
 import imageExtensions from 'image-extensions'
 import isUrl from 'is-url'
 import { Transforms, createEditor, Descendant } from 'slate'
 import {
-  Editable,
   Slate,
-  useFocused,
-  useSelected,
+  Editable,
   useSlateStatic,
+  useSelected,
+  useFocused,
   withReact,
 } from 'slate-react'
 import { withHistory } from 'slate-history'

site/examples/richtext.tsx

@@ -1,12 +1,12 @@
 import React, { useCallback, useMemo, useState } from 'react'
 import isHotkey from 'is-hotkey'
-import { Editable, Slate, useSlate, withReact } from 'slate-react'
+import { Editable, withReact, useSlate, Slate } from 'slate-react'
 import {
+  Editor,
+  Transforms,
   createEditor,
   Descendant,
-  Editor,
   Element as SlateElement,
-  Transforms,
 } from 'slate'
 import { withHistory } from 'slate-history'
 
@@ -28,7 +28,7 @@ const RichTextExample = () => {
   const editor = useMemo(() => withHistory(withReact(createEditor())), [])
 
   return (
-    <Slate editor={editor} value={value} onChange={setValue}>
+    <Slate editor={editor} value={value} onChange={value => setValue(value)}>
       <Toolbar>
         <MarkButton format="bold" icon="format_bold" />
         <MarkButton format="italic" icon="format_italic" />