Docs: Remove duplicate content and update links

docs/contributors/documentation/README.md

@@ -111,7 +111,7 @@ An example, the link to this page is: `/docs/contributors/documentation/README.m
 
 The code example in markdown should be wrapped in three tick marks \`\`\` and should additionally include a language specifier. See this [GitHub documentation around fenced code blocks](https://help.github.com/en/github/writing-on-github/creating-and-highlighting-code-blocks).
 
-A unique feature to the Gutenberg documentation is the `codetabs` toggle, this allows two versions of code to be shown at once. This is used for showing both `JSX` and `Plain` code samples. For example, [on this block tutorial page](/docs/how-to-guides/block-tutorial/block-controls-toolbar-and-sidebar.md).
+A unique feature to the Gutenberg documentation is the `codetabs` toggle, this allows two versions of code to be shown at once. This is used for showing both `JSX` and `Plain` code samples.
 
 Here is an example `codetabs` section:
 

docs/how-to-guides/block-tutorial/applying-styles-with-stylesheets.md

@@ -6,7 +6,7 @@ A block typically inserts markup (HTML) into post content that you want to style
 
 ## Before you start
 
-You will need a basic block and WordPress development environment to implement the examples shown in this guide. See the [create a basic block](/docs/how-to-guides/block-tutorial/writing-your-first-block-type.md) or [block tutorial](/docs/getting-started/devenv/get-started-with-create-block.md) to get setup.
+You will need a basic block and WordPress development environment to implement the examples shown in this guide. See the [Quick Start Guide](/docs/getting-started/quick-start-guide.md) or [block tutorial](/docs/getting-started/tutorial.md) to get set up.
 
 ## Methods to add style
 

docs/how-to-guides/plugin-sidebar-0.md

@@ -6,7 +6,7 @@ How to add a sidebar to your plugin. A sidebar is the region to the far right of
 
 ![Example sidebar](https://raw.githubusercontent.com/WordPress/gutenberg/HEAD/docs/assets/sidebar-up-and-running.png)
 
-_Note: this tutorial covers a custom sidebar, if you are looking to add controls to the sidebar see the [Block Toolbar and Settings Sidebar](/docs/how-to-guides/block-tutorial/block-controls-toolbar-and-sidebar.md)_
+_Note: this tutorial covers a custom sidebar, if you are looking to add controls to the sidebar see the [Block Toolbar and Settings Sidebar](/docs/getting-started/fundamentals/block-in-the-editor.md)_
 
 ## Before you start