Rename Playground to Lab

Author: jelledruyts

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contributing to "azure-ai-search-playground"
+# Contributing to "azure-ai-search-lab"
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a
 Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
@@ -51,12 +51,12 @@ chances of your issue being dealt with quickly:
 * **Suggest a Fix** - if you can't fix the bug yourself, perhaps you can point to what might be
   causing the problem (line of code or commit)
 
-You can file new issues by providing the above information at the corresponding repository's issues link: https://github.com/Azure-Samples/azure-ai-search-playground/issues/new.
+You can file new issues by providing the above information at the corresponding repository's issues link: https://github.com/Azure-Samples/azure-ai-search-lab/issues/new.
 
 ### <a name="submit-pr"></a> Submitting a Pull Request (PR)
 Before you submit your Pull Request (PR) consider the following guidelines:
 
-* Search the repository (https://github.com/Azure-Samples/azure-ai-search-playground/pulls) for an open or closed PR
+* Search the repository (https://github.com/Azure-Samples/azure-ai-search-lab/pulls) for an open or closed PR
   that relates to your submission. You don't want to duplicate effort.
 
 * Make your changes in a new git fork: