doc: documentation is now in the same repository as the code

Demo site will be generated in subfolder /demo

docs/config/widgets.md

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+# Widgets
+
+Widgets are placed at right sidebar of the blog. They are used to display some information such as categories, tags, etc.
+
+You can configure which widgets to display and their order in the homepage and post page.
+
+`widget.homepage` and `widget.page` are arrays of maps. Each map contains two keys: `type` and `params`. `type` is the name of the widget. `params` is the configuration of the widget.
+
+## Available widgets
+
+### archives
+
+Display a list of years with the number of posts published in each year.
+
+You need to create a page with `layout: archives` previously.
+
+#### Paramters
+
+- `limit`: Number of years to display. Default: `10`.
+
+### search
+
+Display a search box. 
+
+You need to create a page with `layout: search` previously.
+
+### categories
+
+Display a list of categories available in the blog.
+
+#### Parameters
+
+- `limit`: number of categories to display. Default: 10
+
+### toc
+
+Display a table of contents of the page.
+
+### tag-cloud
+
+Display a tag cloud.
+
+#### Parameters
+
+- `limit`: number of tags to display. Default: 10
+