feat: remove header image field from content schema

Author: zhongyangxun

src/blog/post-1.md

@@ -3,9 +3,6 @@ title: 'My First Blog Post'
 pubDate: 2022-07-01
 description: 'This is the first post of my new Astro blog.'
 author: 'Astro Learner'
-image:
-  url: 'https://docs.astro.build/assets/rose.webp'
-  alt: 'The Astro logo on a dark background with a pink glow.'
 tags: ['astro', 'blogging', 'learning in public']
 category: '技术实践'
 ---

src/blog/post-2.md

@@ -2,9 +2,6 @@
 title: My Second Blog Post
 author: Astro Learner
 description: "After learning some Astro, I couldn't stop!"
-image:
-  url: 'https://docs.astro.build/assets/arc.webp'
-  alt: 'The Astro logo on a dark background with a purple gradient arc.'
 pubDate: 2022-07-08
 tags: ['astro', 'blogging', 'learning in public', 'successes']
 category: '技术实践'

src/blog/post-3.md

@@ -2,9 +2,6 @@
 title: My Third Blog Post
 author: Astro Learner
 description: 'I had some challenges, but asking in the community really helped!'
-image:
-  url: 'https://docs.astro.build/assets/rays.webp'
-  alt: 'The Astro logo on a dark background with rainbow rays.'
 pubDate: 2022-07-15
 tags: ['astro', 'learning in public', 'setbacks', 'community']
 category: '技术实践'

src/blog/post-4.md

@@ -2,9 +2,6 @@
 title: My Fourth Blog Post
 author: Astro Learner
 description: 'This post will show up on its own!'
-image:
-  url: 'https://docs.astro.build/default-og-image.png'
-  alt: 'The word astro against an illustration of planets and stars.'
 pubDate: 2022-08-08
 tags: ['astro', 'successes']
 category: '技术实践'

src/content.config.ts

@@ -10,10 +10,6 @@ const blog = defineCollection({
     update: z.date().optional(),
     description: z.string(),
     author: z.string(),
-    image: z.object({
-      url: z.string(),
-      alt: z.string(),
-    }),
     category: z.enum(['技术实践', '读书笔记', '碎片随笔', '工具推荐']),
     tags: z.array(z.string()),
     series: z.string().optional(),

src/layouts/PostLayout.astro

@@ -1,14 +1,7 @@
 ---
 import Baselayout from './Baselayout.astro';
-
-const { post } = Astro.props;
 ---
 
 <Baselayout>
-  <img
-    src={post.data.image.url}
-    alt={post.data.image.alt}
-    class="w-full h-auto"
-  />
   <slot />
 </Baselayout>