chore(README.md): fix formatting and add OpenVSX badge

Also Closes #269

Author: matifali

README.md

@@ -1,6 +1,7 @@
 # Coder Remote
 
 [![Visual Studio Marketplace](https://vsmarketplacebadges.dev/version/coder.coder-remote.svg)](https://marketplace.visualstudio.com/items?itemName=coder.coder-remote)
+[![Open VSX Version](https://img.shields.io/open-vsx/v/coder/coder-remote)](https://open-vsx.org/extension/coder/coder-remote)
 [!["Join us on
 Discord"](https://badgen.net/discord/online-members/coder)](https://coder.com/chat?utm_source=github.com/coder/vscode-coder&utm_medium=github&utm_campaign=readme.md)
 
@@ -13,11 +14,12 @@ workspaces with a single click.
 - Works in air-gapped or restricted networks. Just connect to your Coder
   deployment!
 - Supports multiple editors: VS Code, Cursor, and Windsurf.
-  > [!NOTE]  
-  > The extension builds on VSCode provided implementations of SSH. Make sure
-  > you have the correct ssh extension installed for your editor
-  > (ms-vscode-remote.remote-ssh or codeium.windsurf-remote-openssh for
-  > windsurf)
+
+> [!NOTE]  
+> The extension builds on VSCode provided implementations of SSH. Make sure
+> you have the correct ssh extension installed for your editor
+> (ms-vscode-remote.remote-ssh or codeium.windsurf-remote-openssh for
+> windsurf)
 
 ![Demo](https://github.com/coder/vscode-coder/raw/main/demo.gif?raw=true)
 
@@ -26,7 +28,7 @@ workspaces with a single click.
 Launch VS Code Quick Open (Ctrl+P), paste the following command, and press
 enter.
 
-```text
+```shell
 ext install coder.coder-remote
 ```
 
@@ -36,9 +38,9 @@ Alternatively, manually install the VSIX from the
 #### Variables Reference
 
 Coder uses
-${userHome} from VS Code's
+`${userHome}` from VS Code's
 [variables reference](https://code.visualstudio.com/docs/editor/variables-reference).
-Use this when formatting paths in the Coder extension settings rather than ~ or
-$HOME.
+Use this when formatting paths in the Coder extension settings rather than `~` or
+`$HOME`.
 
 Example: ${userHome}/foo/bar.baz