Bias template/tutorial to use .mdx

packages/create-docusaurus/templates/shared/blog/2021-08-26-welcome/index.mdx

@@ -13,8 +13,8 @@ Regular blog authors can be added to `authors.yml`.
 
 The blog post date can be extracted from filenames, such as:
 
-- `2019-05-30-welcome.md`
+- `2019-05-30-welcome.mdx`
-- `2019-05-30-welcome/index.md`
+- `2019-05-30-welcome/index.mdx`
 
 A blog post folder can be convenient to co-locate blog post images:
 

packages/create-docusaurus/templates/shared/docs/intro.mdx

@@ -44,4 +44,4 @@ The `cd` command changes the directory you're working with. In order to work wit
 
 The `npm run start` command builds your website locally and serves it through a development server, ready for you to view at http://localhost:3000/.
 
-Open `docs/intro.md` (this page) and edit some lines: the site **reloads automatically** and displays your changes.
+Open `docs/intro.mdx` (this page) and edit some lines: the site **reloads automatically** and displays your changes.

packages/create-docusaurus/templates/shared/docs/tutorial-basics/congratulations.mdx

@@ -8,7 +8,7 @@ You have just learned the **basics of Docusaurus** and made some changes to the
 
 Docusaurus has **much more to offer**!
 
-Have **5 more minutes**? Take a look at **[versioning](../tutorial-extras/manage-docs-versions.md)** and **[i18n](../tutorial-extras/translate-your-site.md)**.
+Have **5 more minutes**? Take a look at **[versioning](../tutorial-extras/manage-docs-versions.mdx)** and **[i18n](../tutorial-extras/translate-your-site.mdx)**.
 
 Anything **unclear** or **buggy** in this tutorial? [Please report it!](https://github.com/facebook/docusaurus/discussions/4610)
 

packages/create-docusaurus/templates/shared/docs/tutorial-basics/create-a-blog-post.mdx

@@ -8,7 +8,7 @@ Docusaurus creates a **page for each blog post**, but also a **blog index page**
 
 ## Create your first Post
 
-Create a file at `blog/2021-02-28-greetings.md`:
+Create a file at `blog/2021-02-28-greetings.mdx`:
 
 ```md title="blog/2021-02-28-greetings.md"
 ---

packages/create-docusaurus/templates/shared/docs/tutorial-basics/create-a-page.mdx

@@ -7,7 +7,7 @@ sidebar_position: 1
 Add **Markdown or React** files to `src/pages` to create a **standalone page**:
 
 - `src/pages/index.js` → `localhost:3000/`
-- `src/pages/foo.md` → `localhost:3000/foo`
+- `src/pages/foo.mdx` → `localhost:3000/foo`
 - `src/pages/foo/bar.js` → `localhost:3000/foo/bar`
 
 ## Create your first React Page
@@ -32,9 +32,9 @@ A new page is now available at [http://localhost:3000/my-react-page](http://loca
 
 ## Create your first Markdown Page
 
-Create a file at `src/pages/my-markdown-page.md`:
+Create a file at `src/pages/my-markdown-page.mdx`:
 
-```mdx title="src/pages/my-markdown-page.md"
+```mdx title="src/pages/my-markdown-page.mdx"
 # My Markdown page
 
 This is a Markdown page

packages/create-docusaurus/templates/shared/docs/tutorial-basics/markdown-features.mdx

@@ -10,7 +10,7 @@ Docusaurus supports **[Markdown](https://daringfireball.net/projects/markdown/sy
 
 Markdown documents have metadata at the top called [Front Matter](https://jekyllrb.com/docs/front-matter/):
 
-```text title="my-doc.md"
+```text title="my-doc.mdx"
 // highlight-start
 ---
 id: my-doc-id
@@ -22,7 +22,7 @@ slug: /my-custom-url
 
 ## Markdown heading
 
-Markdown text with [links](./hello.md)
+Markdown text with [links](./hello.mdx)
 ```
 
 ## Links
@@ -34,10 +34,10 @@ Let's see how to [Create a page](/create-a-page).
 ```
 
 ```md
-Let's see how to [Create a page](./create-a-page.md).
+Let's see how to [Create a page](./create-a-page.mdx).
 ```
 
-**Result:** Let's see how to [Create a page](./create-a-page.md).
+**Result:** Let's see how to [Create a page](./create-a-page.mdx).
 
 ## Images
 

packages/create-docusaurus/templates/shared/docs/tutorial-extras/manage-docs-versions.mdx

@@ -51,5 +51,5 @@ The docs version dropdown appears in your navbar:
 
 It is possible to edit versioned docs in their respective folder:
 
-- `versioned_docs/version-1.0/hello.md` updates `http://localhost:3000/docs/hello`
+- `versioned_docs/version-1.0/hello.mdx` updates `http://localhost:3000/docs/hello`
-- `docs/hello.md` updates `http://localhost:3000/docs/next/hello`
+- `docs/hello.mdx` updates `http://localhost:3000/docs/next/hello`

packages/create-docusaurus/templates/shared/docs/tutorial-extras/translate-your-site.mdx

@@ -4,7 +4,7 @@ sidebar_position: 2
 
 # Translate your site
 
-Let's translate `docs/intro.md` to French.
+Let's translate `docs/intro.mdx` to French.
 
 ## Configure i18n
 
@@ -21,15 +21,15 @@ module.exports = {
 
 ## Translate a doc
 
-Copy the `docs/intro.md` file to the `i18n/fr` folder:
+Copy the `docs/intro.mdx` file to the `i18n/fr` folder:
 
 ```bash
 mkdir -p i18n/fr/docusaurus-plugin-content-docs/current/
 
-cp docs/intro.md i18n/fr/docusaurus-plugin-content-docs/current/intro.md
+cp docs/intro.mdx i18n/fr/docusaurus-plugin-content-docs/current/intro.mdx
 ```
 
-Translate `i18n/fr/docusaurus-plugin-content-docs/current/intro.md` in French.
+Translate `i18n/fr/docusaurus-plugin-content-docs/current/intro.mdx` in French.
 
 ## Start your localized site