docs: add next js with app router example (#7552)

* move the existing example to with-script-in-browser

* Add example with next js app router

* disable ssr for excalidraw client comp

* typo

* update output dir

* don't include nextjs example in tsconfig

* remove meta.json

* lint

* remove example.ts

* port

* move the examples outside packages and use the deps as workspaces in examples

* update gitignore

* fix example

* update path of build dir

* fix

* fix scripts

* try local path

* fix

* update commands

* fix

* fix

* fix script

* skip ts

* disable ts

* add vercel.json

* install

* update tsconfig

* fix lint

* remove console.log

* lets see if this works

* revert

* remove ts nocheck

* add types and some utils in nextjs example

* fix types

* updatw example and remove nextjs dynamic syntax so we don't import excal twice

* move both examples to workspaces and create generic example to be used by browser and next js both

* copy the static assets to nextjs

* fix ts config

* render custom menu items

* fix custom footer

* fix types in browser example

* use regular imports for importing excal and import it using dynamic next js in app router instead

* Add example for pages router

* fix css discrepancies

* fix css

* configure output dir

* fix

* fix css

* rename to with-nextjs

* move components to examples/excalidraw/components

examples/excalidraw/components/sidebar/ExampleSidebar.tsx

@@ -0,0 +1,31 @@
+import { useState } from "react";
+import "./ExampleSidebar.scss";
+
+export default function Sidebar({ children }: { children: React.ReactNode }) {
+  const [open, setOpen] = useState(false);
+
+  return (
+    <>
+      <div id="mySidebar" className={`sidebar ${open ? "open" : ""}`}>
+        <button className="closebtn" onClick={() => setOpen(false)}>
+          x
+        </button>
+        <div className="sidebar-links">
+          <button>Empty Home</button>
+          <button>Empty About</button>
+        </div>
+      </div>
+      <div className={`${open ? "sidebar-open" : ""}`}>
+        <button
+          className="openbtn"
+          onClick={() => {
+            setOpen(!open);
+          }}
+        >
+          Open Sidebar
+        </button>
+        {children}
+      </div>
+    </>
+  );
+}