add documentation for different menu type

.tarignore

@@ -1,9 +1,12 @@
+.envrc
 .tarignore
 .dictionary*
 .git*
 .drone*
 .lighthouse*
 .markdownlint*
+.jsbeautify*
+.prettier*
 example*
 gulp*
 package*

exampleSite/content/usage/getting-started.md

@@ -22,7 +22,7 @@ If you want to use the theme from a cloned branch instead of a release tarball y
 npm install
 
 # run gulp pipeline to build required assets
-gulp default
+npx gulp default
 ```
 
 ## Using the theme
@@ -98,5 +98,5 @@ git clone https://github.com/thegeeklab/hugo-geekdoc.git themes/geekdoc
 Build required theme assets e.g. CSS files and SVG sprites with `gulp`.
 
 ```Shell
-gulp default
+npx gulp default
 ```

exampleSite/content/usage/menus.md

@@ -1,7 +1,30 @@
----
+The theme supports two different kinds of menus. [File-tree menu](#file-tree-menu) is the default one and does not require further configuration to work. If you want full control about your menu the [bundle menu](#bundle-menu) is a powerful option to accomplish it.
-draft: true
----
 
 ## File-tree menu
 
+As the name already suggests, the file tree menu builds a menu from the file system structure of the content folder. By default, areas and subareas are sorted alphabetically by the title of the pages. To manipulate the order the `weight` parameter in a page [front matter](https://gohugo.io/content-management/front-matter/) can be used. To structure your content folder you have to use [page bundles](https://gohugo.io/content-management/organization/#page-bundles), single files are **not** supported. Hugo will render build single files in the content folder just fine but it will not be added to the menu.
+
+**Example:**
+
+A file structure like shown below...
+
+```plain
+content/
+├── level-1
+│   ├── _index.md
+│   ├── level-1-1.md
+│   ├── level-1-2.md
+│   └── level-1-3
+│       ├── _index.md
+│       └── level-1-3-1.md
+└── level-2
+    ├── _index.md
+    ├── level-2-1.md
+    └── level-2-2.md
+```
+
+... results in a menu that looks like this.
+
+[![Example file-tree menu](/media/file-tree.png)](/media/file-tree.png)
+
 ## Bundle menu