docs: v7 framework tutorial (#12504)

* Add basic tutorial setup

* Update React Router logo mark

* Update app.css and root.tsx for tutorial

* Outline the framework tutorial

* Add setup, root route, nested routes and outlets sections

* add contact ui, client side rendering, type safety, and hydrate fallback sections

* Add url params in loaders, throwing responses, data mutations, creating contacts, and updating data sections

* Introduce pre-rendering and server side rendering earlier

* mutation, redirecting, active link styling

* finish copying all sections of the tutorial

* Minor fixes and TODOs for images

* Update docs/tutorials/framework.md

Co-authored-by: Matt Brophy <[email protected]>

* most of matt's suggestions

* rename and reorder files

* Flip about and index section

* Clean up the language for client side routing a bit

* Add image references and minor fixes

* change to "Address Book"

* Move tutorial code into a subdirectory

---------

Co-authored-by: Matt Brophy <[email protected]>

docs/explanation/index.md

@@ -1,4 +1,4 @@
 ---
 title: Explanations
-order: 4
+order: 5
 ---

docs/how-to/index.md

@@ -1,4 +1,4 @@
 ---
 title: How-Tos
-order: 3
+order: 4
 ---