add section for writing docs in the dev workflow

apps/docs/contributing/development-workflow/5-writing-docs.mdx

@@ -0,0 +1,47 @@
+---
+title: '5. Writing docs'
+sidebarTitle: '5. Writing docs'
+'og:image': 'https://react.email/static/covers/react-email.png'
+---
+
+For our documentation we use the amazing [Mintlify](https://mintlify.com/), so
+you will need to have their CLI installed globally to be able to preview the docs:
+
+<CodeGroup>
+
+```sh npm
+npm install mintlify -g
+```
+
+```sh yarn
+yarn global add mintlify
+```
+
+```sh pnpm
+pnpm add mintlify -g
+```
+
+```sh bun
+bun add mintlify -g
+```
+
+</CodeGroup>
+
+With just that you can go ahead and run the following to get a preview of the docs
+
+```sh apps/docs
+mintlify dev
+```
+
+Check out [Mintlify's development guide](https://mintlify.com/docs/development)
+for a few more interesting development tools.
+
+## Components
+
+Mintlify uses `mdx` to allow us to write docs in a composable ways. Because of
+`mdx`, we can build [our own
+components](https://mintlify.com/docs/reusable-snippets#reusable-components)
+but it's always best to use the components Mintlify already provides us, so
+always check up on [this page](https://mintlify.com/docs/content/components) of
+their docs for documentation of their components.
+

apps/docs/mint.json

@@ -82,7 +82,8 @@
             "contributing/development-workflow/1-setup",
             "contributing/development-workflow/2-running-tests",
             "contributing/development-workflow/3-linting",
-            "contributing/development-workflow/4-building"
+            "contributing/development-workflow/4-building",
+            "contributing/development-workflow/5-writing-docs"
           ]
         }
       ]