fix: import z directly from zod to resolve deprecation warnings

src/content.config.ts

@@ -1,5 +1,6 @@
 import { glob } from 'astro/loaders'
-import { defineCollection, z } from 'astro:content'
+import { defineCollection } from 'astro:content'
+import { z } from 'zod'
 
 const blog = defineCollection({
   loader: glob({ pattern: '**/*.{md,mdx}', base: './src/content/blog' }),
@@ -23,7 +24,7 @@ const projects = defineCollection({
       description: z.string(),
       tags: z.array(z.string()),
       image: image(),
-      link: z.string().url().optional(),
+      link: z.url().optional(),
       order: z.number().optional(),
       startDate: z.coerce.date().optional(),
       endDate: z.coerce.date().optional(),