fix: Update broken links from Google repo (#2655)

Author: khaliladev

examples/developer-tools/src/index.html

@@ -5,7 +5,7 @@
     <link
       rel="icon"
       type="image/x-icon"
-      href="https://google.github.io/blockly-samples/favicon.ico" />
+      href="https://raspberrypifoundation.github.io/blockly-samples/favicon.ico" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Blockly Developer Tools</title>
     <link rel="preconnect" href="https://fonts.googleapis.com" />

gh-pages/README.md

@@ -50,4 +50,4 @@ Note: Updating GitHub Pages is done automatically when publishing plugins throug
         npm run deploy:upstream
         ```
 
-        Test at https://google.github.io/blockly-samples/
+        Test at https://raspberrypifoundation.github.io/blockly-samples/

plugins/dev-tools/README.md

@@ -12,7 +12,7 @@ npm install @blockly/dev-tools -D --save
 
 ### Playground
 
-The playground is a tremendously useful tool for debugging your Blockly project. As a preview, here is [one of the plugin playgrounds](https://google.github.io/blockly-samples/plugins/theme-modern/test/). The playground features are:
+The playground is a tremendously useful tool for debugging your Blockly project. As a preview, here is [one of the plugin playgrounds](https://raspberrypifoundation.github.io/blockly-samples/plugins/theme-modern/test/). The playground features are:
 
 - All the default blocks
 - All the language generators (JavaScript, Python, PHP, Lua, and Dart)