docs: Add handle_errors, CEL matcher; a few other improvements

src/docs/markdown/caddyfile/directives/file_server.md

@@ -13,7 +13,7 @@ A static file server. It works by appending the request's URI path to the [site'
 file_server [<matcher>] [browse] {
 	root   <path>
 	hide   <files...>
-	index  <files...>
+	index  <filenames...>
 	browse [<template_file>]
 }
 ```
@@ -21,6 +21,7 @@ file_server [<matcher>] [browse] {
 - **browse** enables file listings for requests to directories that do not have an index file.
 - **root** sets the path to the site root for just this file server instance, overriding any other. Default: `{http.vars.root}` or the current working directory. Note: When specified as a subdirective like this, only this directive will know this root; for other directives (like [try_files](/docs/caddyfile/directives/try_files) or [templates](/docs/caddyfile/directives/templates)) to know the same site root, use the [root](/docs/caddyfile/directives/root) directive, not subdirective.
 - **hide** is a list of files to hide; if requested, the file server will pretend they do not exist. The active configuration file will be added by default.
+- **index** is a list of filenames to look for as index files. Default: `index.html index.txt`
 - **<template_file>** is an optional custom template file to use for directory listings.
 
 

src/docs/markdown/caddyfile/directives/handle_errors.md

@@ -0,0 +1,19 @@
+---
+title: handle_errors (Caddyfile directive)
+---
+
+# handle_errors
+
+Sets up error handlers.
+
+When the normal HTTP request handlers return an error, normal procesing stops and the error handlers are invoked. Error handlers form a route which is just like normal routes, and they can do anything that normal routes can do. This enables great control and flexibility when handling errors during HTTP requests.
+
+## Syntax
+
+```
+handle_errors {
+	<directives...>
+}
+```
+
+- **<directives...>** is a list of HTTP handler directives, directive blocks, or matchers; one per line.