docs: add include files documentation (#13)

Author: EmericW

src/lib/docs/cli/build.md

@@ -58,6 +58,16 @@ Include only the categories with these names. Corresponding config key: `include
 jsrepo build --include-categories utils scripts
 ```
 
+### `--include-files`
+
+Additional files to include in the manifest. Corresponding config key: `includeFiles`
+
+#### Usage
+
+```sh
+jsrepo build --include-files ./src/**/*.txt
+```
+
 ### `--exclude-blocks`
 
 Do not include the blocks with these names. Corresponding config key: `excludeBlocks`

src/lib/docs/registry/jsrepo-build-config-json.md

@@ -145,6 +145,17 @@ The path of the file in your registry.
 }
 ```
 
+### `includeFiles`
+
+Additional files to include in the manifest. This can be used to include arbitrary extra static files which don't have language support.
+This config option supports ignore style glob patterns.
+
+```jsonc showLineNumbers
+{
+	"includeFiles": ["./src/blocks/header/hero.png", "./src/**/*.txt"]
+}
+```
+
 ### `listBlocks`
 
 `listBlocks` is a list of block names that should be listed when the user runs the `add` command.