Add keyboard shortcuts: new, escape, and hard break (#552)

* Add keyboard shortcuts: new, escape, and hard break

* Add preferences modal

* Remove code accidentally re-added due to rebase

* Fix incorrect copy and lint

* Put stuff back so diffs are clearer

* Re-add invite codes to settings

* Address comments

* Tune the copy

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/composer/text-input/TextInput.web.tsx

@@ -4,6 +4,7 @@ import {RichText} from '@atproto/api'
 import {useEditor, EditorContent, JSONContent} from '@tiptap/react'
 import {Document} from '@tiptap/extension-document'
 import History from '@tiptap/extension-history'
+import Hardbreak from '@tiptap/extension-hard-break'
 import {Link} from '@tiptap/extension-link'
 import {Mention} from '@tiptap/extension-mention'
 import {Paragraph} from '@tiptap/extension-paragraph'
@@ -72,6 +73,7 @@ export const TextInput = React.forwardRef(
           }),
           Text,
           History,
+          Hardbreak,
         ],
         editorProps: {
           attributes: {