Updated CONTRIBUTING.md file to point at dev sites insead of GitHub wiki sites.

.github/CONTRIBUTING.md

@@ -1,14 +1,14 @@
-:wave: Welcome! We'd love to accept your patches and contributions to this project. 
+:wave: Welcome! We'd love to accept your patches and contributions to this project.
 
 ## How can I contribute?
 
 - [Suggest](https://github.com/google/blockly-samples/issues/new?assignees=&labels=type%3A+feature+request%2C+triage&template=feature_request.md) plugins, examples, or codelabs
-  - :arrow_right: Start by reading [How To Write A Good Issue](https://github.com/google/blockly-samples/wiki/How-to-Write-a-Good-Issue)
+  - :arrow_right: Start by reading [How To Write A Good Issue](https://developers.google.com/blockly/guides/modify/contribute/write_a_good_issue)
 - Implement plugins, examples, or codelabs
-  - :arrow_right: Read up on how to [Add a Plugin](https://github.com/google/blockly-samples/wiki/Adding-A-Plugin) or [Write a Codelab](https://github.com/google/blockly-samples/wiki/Writing-a-Codelab)
-- [Report bugs](https://github.com/google/blockly-samples/issues/new?assignees=&labels=type%3A+bug%2C+triage&template=bug_report.md)  
-  - :arrow_right: Start by reading [How To Write A Good Issue](https://github.com/google/blockly-samples/wiki/How-to-Write-a-Good-Issue)
-- Fix bugs
+  - :arrow_right: Read up on how to [Add a Plugin](https://developers.google.com/blockly/guides/modify/contribute/add_a_plugin) or [Write a Codelab](https://developers.google.com/blockly/guides/modify/contribute/write_a_codelab)
+- [Report bugs](https://github.com/google/blockly-samples/issues/new?assignees=&labels=type%3A+bug%2C+triage&template=bug_report.md)
+  - :arrow_right: Start by reading [How To Write A Good Issue](https://developers.google.com/blockly/guides/modify/contribute/write_a_good_issue)
+- [Fix bugs](https://developers.google.com/blockly/guides/modify/contribute/issue_labels)
   - :arrow_right: Start by reading [Finding a Good Issue](https://github.com/google/blockly-samples/wiki/Finding-a-Good-Issue:-Labels)
 
 ## Contributor License Agreement
@@ -26,14 +26,15 @@ again.
 ## Code reviews
 
 All submissions, including submissions by project members, require review. We
-use GitHub pull requests for this purpose. 
+use GitHub pull requests for this purpose.
 
-:arrow_right: Read more about our [PR review process](https://github.com/google/blockly-samples/wiki/The-Pull-Request-Review-Process) in the wiki.
+:arrow_right: Read more about our [PR review process](https://developers.google.com/blockly/guides/modify/contribute/pr_review_process) in the wiki.
 
 ## Community guidelines
 
 This project follows
 [Google's Open Source Community Guidelines](https://opensource.google.com/conduct/).
 
 ## More information
-Head over to the [wiki](https://github.com/google/blockly-samples/wiki) for more information, including an [overview of the repository structure](https://github.com/google/blockly-samples/wiki/Repository-Structure) and details of our [publishing process](https://github.com/google/blockly-samples/wiki/Plugin-Publishing).
+
+Head over to the [wiki](https://developers.google.com/blockly/guides/modify/contributing) for more information, including an [overview of the repository structure](https://developers.google.com/blockly/guides/modify/contribute/samples_repository_structure) and details of our [publishing process](https://developers.google.com/blockly/guides/modify/contribute/add_a_plugin#publishing).