Update docs for optional field

docs/configuration.md

@@ -79,18 +79,34 @@ To manage hook command sequences, create a single hook that runs a shell command
 
 ```toml
 [[hooks]]
-name = "create file"
+key = "create_file"
 command = ["bash", "-c", "touch new_file && chmod +x new_file"]
 ```
+### key `string`
 
-### name `string`
-
-The name of the hook.
+The identifier for the hook.
 
 ### command `string[]`
 
 The command to execute. The first element is the command and the rest are arguments.
 
+### optional
+
+When defined, the user can toggle the hook. `default` describes the default state of the hook.
+
+```
+optional = { default = true }
+```
+
 ### if `string`
 
 The condition to execute the hook. The condition is templated just like the template files, allowing you to conditionally execute a hook.
+
+### name `string`
+
+The name of the hook.
+
+### description `string`
+
+A description for the hook.
+