add the text extension page

docs/src/docPages/api/extensions/text.md

@@ -1,2 +1,12 @@
 # Text
-Enables you to use text in the editor.
+**The `Text` extension is required**, at least if you want to work with text of any kind and that’s very likely. This extension is a little bit different, it doesn’t even render HTML. It’s plain text, that’s all.
+
+:::warning Breaking Change from 1.x → 2.x
+Tiptap 1 tried to hide that node from you, but it has always been there.
+:::
+
+## Source Code
+[packages/extension-text/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-text/)
+
+## Usage
+<demo name="Extensions/Text" highlight="12,30" />