Standardise to sh instead of shell

Author: delucis

packages/integrations/deno/README.md

@@ -23,7 +23,7 @@ If you wish to [use server-side rendering (SSR)](https://docs.astro.build/en/gui
 
 First, install the `@astrojs/deno` package using your package manager. If you're using npm or aren't sure, run this in the terminal:
 
-```shell
+```sh
 npm install @astrojs/deno
 ```
 
@@ -53,7 +53,7 @@ See the `start` option below for how you can have more control over starting the
 
 You can also run the script directly using deno:
 
-```shell
+```sh
 deno run --allow-net --allow-read --allow-env ./dist/server/entry.mjs
 ```
 

packages/integrations/netlify/README.md

@@ -62,7 +62,7 @@ After [performing a build](https://docs.astro.build/en/guides/deploy/#building-y
 
 Now you can deploy. Install the [Netlify CLI](https://docs.netlify.com/cli/get-started/) and run:
 
-```shell
+```sh
 netlify deploy --build
 ```
 

packages/integrations/node/README.md

@@ -23,7 +23,7 @@ If you wish to [use server-side rendering (SSR)](https://docs.astro.build/en/gui
 
 First, install the `@astrojs/node` package using your package manager. If you're using npm or aren't sure, run this in the terminal:
 
-```shell
+```sh
 npm install @astrojs/node
 ```