build: Use prettier for markdown

Stop ignoring .md files in prettier and fix existing issues.

docs/corporate-proxy.md

@@ -15,6 +15,7 @@ In Windows environments, add the `HTTP_PROXY` and `HTTPS_PROXY` system environme
 ### Unix
 
 Add these lines to your `~/.bash_profile` or `~/.profile`:
+
 ```sh
 export HTTP_PROXY="http://<username>:<password>@<proxy_server>:<proxy_port>"
 export HTTPS_PROXY="$HTTP_PROXY"
@@ -44,6 +45,7 @@ export NO_PROXY="127.0.0.1, localhost, <your_local_server_ip_or_hostname>"
 ### Npm
 
 Run this command in your project directory:
+
 ```sh
 npm set strict-ssl false
 ```