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

Demo site will be generated in subfolder /demo

docs/index.md

@@ -0,0 +1,37 @@
+---
+layout: home
+
+title: Stack
+titleTemplate: Card-style Hugo theme designed for bloggers
+
+hero:
+  name: Stack
+  text: Card-style theme designed for bloggers
+  image:
+    src: /logo.png
+    alt: Stack
+  actions:
+    - theme: brand
+      text: Get Started
+      link: /guide/getting-started
+    - theme: alt
+      text: View Demo
+      link: /demo
+    - theme: alt
+      text: View on GitHub
+      link: https://github.com/CaiJimmy/hugo-theme-stack
+
+features:
+  - title: No CSS and JavaScript framework
+    details: Keep your site lightweight and fast. All the styles are written in SCSS and the scripts are written in vanilla JavaScript.
+    icon: ⚡️
+  - title: Dark mode
+    details: Dark mode is supported by default. It will be automatically enabled when the system is in dark mode.
+    icon: 🌙
+  - title: Multilingual mode and RTL support
+    details: Support for multiple languages and right-to-left languages out of the box. No need to worry about i18n.
+    icon: 🌐
+  - title: A set of useful features
+    details: Table of contents, local search, code highlighting, image zooming, and more.
+    icon: 🧰
+---