Fix broken link in doc/getting started (#335)

* fix broken link in introduction.md

* fix broken link in your-first-neutralinojs-app.mdx

* fix broken link in your-first-neutralinojs-app.mdx

docs/getting-started/introduction.md

@@ -50,6 +50,6 @@ officially support all popular CPU architectures with the CLI soon! However, you
 binaries from the source on almost all desktop operating systems and CPU architectures out there.
 
 If you need Neutralinojs binaries for non-x64 CPU, learn how to build Neutralinojs from source
-with [this guide](contributing/framework-developer-guide#setup-and-build-the-framework).
+with [this guide](../contributing/framework-developer-guide.mdx#setup-and-build-the-framework).
 
 

docs/getting-started/your-first-neutralinojs-app.mdx

@@ -186,14 +186,14 @@ This command will do the work blazing fast because there is no compilation proce
 Now you know how to create Neutralinojs applications. We will suggest you to look into the
 following topics next.
 
-- [neutralino.config.json](../configuration/neutralino.config.json)
-- [Project structure](../configuration/project-structure)
-- [neu CLI](../cli/neu-cli)
-- [Global variables](../api/global-variables)
-- [Application modes](../configuration/modes)
-- [Native API overview](../api/overview)
+- [neutralino.config.json](../configuration/neutralino.config.json.md)
+- [Project structure](../configuration/project-structure.md)
+- [neu CLI](../cli/neu-cli.md)
+- [Global variables](../api/global-variables.md)
+- [Application modes](../configuration/modes.md)
+- [Native API overview](../api/overview.md)
 
 We've built the above example application with vanilla JavaScript. However, you can use your favorite frontend
 framework to build Neutralinojs apps.
 
-Check more details about frontend framework support [here](../configuration/project-structure#developing-apps-with-frontend-frameworks).
+Check more details about frontend framework support [here](../configuration/project-structure.md#developing-apps-with-frontend-frameworks).