Updated _Sidebar (markdown)

_Sidebar.md

@@ -26,7 +26,6 @@
 - **[Code Conventions](https://github.com/micropython/micropython/blob/master/CODECONVENTIONS.md)**
 - **[[Contributor Guidelines|ContributorGuidelines]]**
 - **[[Development Workflow|DevelWorkflow]]**
-- **[[micropython Internals|Internals]]**
 - **[Code Coverage](https://micropython.org/resources/code-coverage/)**
 - **[Code Statistics](http://micropython.org/resources/code-dashboard/)**
 - **[[ARM Toolchain|Getting Started STM]]**