refactor(scss): remove--zh-font-family (#1183)

* fix(scss): limit `--zh-font-family` to only simplified Chinese

* feat(sampleSite): add test page for Japanese & Traditional Chinese

* Remove `--zh-font-family` variable

---------

Co-authored-by: Jimmy <jimmy@cai.im>

exampleSite/content/post/chinese-test/index.ja.md

@@ -0,0 +1,26 @@
+---
+title: Japanese Test
+description: これはサブタイトル
+date: 2020-09-09
+slug: test-chinese
+image: helena-hertz-wWZzXlDpMog-unsplash.jpg
+categories:
+    - Test
+    - テスト
+---
+
+## 本文テスト（フォント）
+
+返扇花週認契適違込遷雇述請曜藤突扉直角
+
+## 引用
+
+> 国破れて山河在り\
+> 城春にして草木深し\
+> 時に感じては花にも涙を濺ぎ\
+> 別れを恨んでは鳥にも心を驚かす
+>
+> 烽火三月に連なり\
+> 家書万金に抵たる\
+> 白頭掻けば更に短く\
+> 渾べて簪に勝へざらんと欲す

exampleSite/content/post/chinese-test/index.zh-cn.md

@@ -36,4 +36,8 @@ categories:
 ![Photo by Helena Hertz on Unsplash](helena-hertz-wWZzXlDpMog-unsplash.jpg)  ![Photo by Hudai Gayiran on Unsplash](hudai-gayiran-3Od_VKcDEAA-unsplash.jpg)
 ```
 
-相册语法来自 [Typlog](https://typlog.com/)
+相册语法来自 [Typlog](https://typlog.com/)
+
+## 字体
+
+返扇花週認契適違込遷雇述請曜藤突扉直角

exampleSite/content/post/chinese-test/index.zh-tw.md

@@ -0,0 +1,14 @@
+---
+title: Chinese Test
+description: 這是一個副標題
+date: 2020-09-09
+slug: test-chinese
+image: helena-hertz-wWZzXlDpMog-unsplash.jpg
+categories:
+    - Test
+    - 測試
+---
+
+## 正文測試（字體）
+
+返扇花週認契適違込遷雇述請曜藤突扉直角