feat(docs): update stackblitz links; add stackblitz to Playground page

Author: rstoenescu

docs/src/components/HeaderMenu.vue

@@ -107,12 +107,12 @@ div
           q-icon(:name="fabJsfiddle")
         q-item-section jsFiddle
 
-      q-item(clickable, href="https://stackblitz.com/fork/quasarframework", target="_blank", rel="noopener")
+      q-item(clickable, href="https://stackblitz.quasar.dev", target="_blank", rel="noopener")
         q-item-section.text-light-blue-14(avatar)
           q-icon(:name="fasBolt")
         q-item-section StackBlitz (Vite)
 
-      q-item(clickable, href="https://stackblitz.com/fork/quasarframework-webpack", target="_blank", rel="noopener")
+      q-item(clickable, href="https://stackblitz-webpack.quasar.dev", target="_blank", rel="noopener")
         q-item-section.text-light-blue-14(avatar)
           q-icon(:name="fasBolt")
         q-item-section StackBlitz (Webpack)

docs/src/pages/start/playground.md

@@ -12,10 +12,16 @@ You can fork and use these links for reporting issues on GitHub too. These links
 
 Make sure to read [about it](/start/umd) before diving in. When you use jsFiddle/Codepen you can skip the Installation section.
 
-#### Codesandbox Template
+### Quasar CLI
 
-For more intricate Quasar code examples, like when using boot files, Vuex, etc, fork our Codesandbox:
+For more intricate Quasar code examples, like when using all the features of Quasar CLI, boot files, Pinia, etc, then:
+#### Stackblitz
 
-| Supplier | URL |
+| Type | URL |
 | --- | --- |
-| Codesandbox | [https://codesandbox.quasar.dev](https://codesandbox.quasar.dev) |
+| Vite | [https://stackblitz.quasar.dev](https://stackblitz.quasar.dev) |
+| Webpack | [https://stackblitz-webpack.quasar.dev](https://stackblitz-webpack.quasar.dev) |
+
+#### Codesandbox Template
+
+Fork: [https://codesandbox.quasar.dev](https://codesandbox.quasar.dev)

docs/src/pages/start/quasar-cli.md

@@ -19,7 +19,7 @@ Quasar CLI is the pride of Quasar Framework. You can seamlessly build:
 You can try Quasar CLI online directly in the browser, without installing anything!
 You will also be able to use the command line, so it will be almost identical to creating a project locally.
 
-[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/fork/quasarframework)
+[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.quasar.dev)
 
 ## TL;DR