feat: implement barebone zola templates

themes/emily_zola_theme/README.md

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+# emily_zola_theme
+
+![screenshot01](/static/images/ss01.png)
+
+
+A KISS theme for Zola (static site generator written in Rust). 
+
+Features:
+- simple & clean
+- mobile-friendly
+- MathJax support
+
+Demo site is [here](https://emily-zola-theme.netlify.app/).
+
+## Usage
+
+```
+cd YOUR_SITE_DIRECTORY/themes
+git clone https://github.com/kyoheiu/emily_zola_theme.git
+```
+
+and set the theme-name in `config.toml` to `emily_zola_theme`.
+
+```
+theme = "emily_zola_theme"
+```
+
+## example articles
+
+In `YOUR_SITE_DIRECTORY/themes/emily_zola_theme/content`.
+
+## MathJax support
+
+To use MathJax, add the following lines to the front matter in `.md` file. `[extra]` is mandatory:
+
+```
+[extra]
+math = true
+```
+
+## How to customize
+In addition to default values, you can customize following parts easily:
+
+- author name (appears in footer)
+- header icon (appears in header)
+- favicon
+- header icon size (default width: 70px)
+- number of posts in `index.html` (default 5)
+
+Set your own in `themes/emily_zola_theme/theme.toml`, or to overwrite, copy `[extra]` block, paste it into your `config.toml` and edit.