docs: mark as featured and add search logic paragraph

src/content/blog/astro-paper-2.md

@@ -3,6 +3,7 @@ author: Sat Naing
 pubDatetime: 2023-01-30T15:57:52.737Z
 title: AstroPaper 2.0
 postSlug: astro-paper-2
+featured: true
 ogImage: ""
 tags:
   - release
@@ -36,6 +37,10 @@ Contents are now fetched with `getCollection` function. No relative path to the
 + const postImportResult = await getCollection("blog");
 ```
 
+### Modified Search Logic for better Search Result
+
+In the older version of AstroPaper, when someone search some article, the search cirtea keys that will be searched are `title`, `description` and `headings` (heading means all the headings h1 ~ h6 of the blog post). In AstroPaper v2, only `title` and `description` will be searched as the user types.
+
 ### Renamed Frontmatter Properties
 
 The following frontmatter properties are renamed.