docs: fix markdown

Author: kenjis

README.md

@@ -40,14 +40,16 @@ With those out of the way, it only takes a few small steps to get the project up
 
 1 - Clone the repo if you haven't already, from the CLI:
 
-    git clone https://github.com/codeigniter4projects/playground
+```console
+git clone https://github.com/codeigniter4projects/playground
+```
 
 That creates a new directory, `playground`, under your current directory.
 
 2 - Enter the new directory and install the project dependencies with Composer. NOTE: The command shown
 here assumes that you have Composer loaded globally. If you don't, then pretend we're using `composer.phar`.
 
-```
+```console
 cd playground
 composer install
 ```
@@ -66,19 +68,23 @@ composer install
 
 4 - Back on the command line, we install all of the needed database tables and sample data.
 
-```
+```console
 php spark migrate
 php spark db:seed PlaygroundSeeder
 ```
 
 5 - That's it! If you're hosting through Apache, Nginx, etc, then head to your site. If you just want a quick
 way to work with your site locally, go back to the CLI and start up `spark`, CodeIgniter's small server.
 
-    php spark serve
+```console
+php spark serve
+```
 
 If you get would like to change the port it's running on, that's no problem:
 
-    php spark serve --port 8081
+```console
+php spark serve --port 8081
+```
 
 Enjoy!