docs: add theme-color-schemes guide

- remove 95% width restriction
- adjust the transparency of the buttons
- update tag formatting for posts
- update the offset of the underline for links

src/content/posts/guides/Theme Guide-zh-tw.md

@@ -2,7 +2,9 @@
 title: 主題上手指南
 published: 2025-01-26
 updated: 2025-03-12
-tags: ["部落格主題","指南"]
+tags:
+  - 部落格主題
+  - 指南
 pin: 99
 lang: zh-tw
 abbrlink: theme-guide
@@ -210,7 +212,9 @@ published: 2025-01-26
 # 可選
 description: 自動選取文章前 120 字作為描述。
 updated: 2025-03-26
-tags: ["部落格主題", "指南"]
+tags:
+  - 部落格主題
+  - 指南
 
 # 進階，可選
 draft: true/false