✨ feat: add new post creation script and theme update script, remove git-protect.list and sync-upstream.sh

- Deleted `README-zh.md` and `README.md` as they are no longer needed.
- Removed `git-protect.list` to streamline the synchronization process.
- Introduced `new-post.ts` script for easier blog post creation with default metadata.
- Added `update-theme.ts` script to simplify theme updates from the upstream repository.
- Updated content configuration to handle optional updated dates correctly.
- Adjusted pin values in theme guide documents to allow a range from 0-99 instead of 1-99.

src/content.config.ts

@@ -10,7 +10,10 @@ const posts = defineCollection({
     published: z.date(),
     // optional
     description: z.string().optional().default(''),
-    updated: z.date().optional(),
+    updated: z.preprocess(
+      val => val === '' ? undefined : val,
+      z.date().optional(),
+    ),
     tags: z.array(z.string()).optional().default([]),
     // Advanced
     draft: z.boolean().optional().default(false),

src/content/posts/guides/Theme Guide-en.md

@@ -301,7 +301,7 @@ tags:
 
 # Advanced, Optional
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide

src/content/posts/guides/Theme Guide-es.md

@@ -301,7 +301,7 @@ tags:
 
 # Avanzado, Opcional
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide

src/content/posts/guides/Theme Guide-ja.md

@@ -301,7 +301,7 @@ tags:
 
 # 高度な設定（任意）
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide

src/content/posts/guides/Theme Guide-ru.md

@@ -301,7 +301,7 @@ tags:
 
 # Расширенные, опциональные
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide

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

@@ -301,7 +301,7 @@ tags:
 
 # 進階，可選
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide

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

@@ -301,7 +301,7 @@ tags:
 
 # 进阶，可选
 draft: true/false
-pin: 1-99
+pin: 0-99
 toc: true/false
 lang: de/en/es/fr/ja/ko/pl/pt/ru/zh/zh-tw
 abbrlink: theme-guide