add Upgrade docs to gh-pages

Author: Freymaurer

docs/docs/Upgrade.md docs/docs/api-docs/Upgrade.mddocs/docs/Upgrade.md renamed to docs/docs/api-docs/Upgrade.md

@@ -1,11 +1,19 @@
 ---
-title: Upgrade from 2.x to 3.x
+title: Upgrade to v3
 displayed_sidebar: docsSidebar
-sidebar_position: 999
+sidebar_position: 102
 ---
 
 A lot fo F# wrapper magic was removed. React bindings now behave as close as possible to actual React functionality.
 
+## Update React version
+
+Feliz 3.x requires React 19 or higher. Update your `package.json` dependencies with
+
+```bash
+npm i react@19 react-dom@19
+```
+
 ## Update Fable Version
 
 Get the latest fable version (currently pre-release).

docs/docs/api-docs/react-dom/_category_.json

@@ -1,7 +1,7 @@
 {
   "label": "React-Dom",
   "collapsible": false,
-  "position": 1000,
+  "position": 101,
   "link": {
     "type": "generated-index",
     "title": "React-DOM overview"

docs/docs/api-docs/react/_category_.json

@@ -1,7 +1,7 @@
 {
   "label": "React",
   "collapsible": false,
-  "position": 999,
+  "position": 100,
   "link": {
     "type": "generated-index",
     "title": "React overview"