docs: add a new theme and add main image in v3 post

src/content/blog/astro-paper-3.md

@@ -4,6 +4,7 @@ pubDatetime: 2023-09-25T10:25:54.547Z
 title: AstroPaper 3.0
 postSlug: astro-paper-v3
 featured: true
+ogImage: https://github.com/satnaing/astro-paper/assets/53733092/1ef0cf03-8137-4d67-ac81-84a032119e3a
 tags:
   - release
 description: "AstroPaper Version 3: Elevating Your Web Experience with Astro v3 and Seamless View Transitions"
@@ -11,6 +12,8 @@ description: "AstroPaper Version 3: Elevating Your Web Experience with Astro v3
 
 We're excited to announce the release of AstroPaper v3, packed with new features, enhancements, and bug fixes to elevate your web development experience. Let's dive into the highlights of this release:
 
+![AstroPaper v3](@assets/images/AstroPaper-v3.png)
+
 ## Table of contents
 
 ## Features & Changes

src/content/blog/predefined-color-schemes.md

@@ -149,3 +149,18 @@ html[data-theme="dark"] {
   --color-border: 171, 75, 8;
 }
 ```
+
+### Astro Deep Purple (New dark theme in AstroPaper 3)
+
+![AstroPaper v3 new theme](https://github.com/satnaing/astro-paper/assets/53733092/c8b5d7e1-a3bc-4852-a5ad-4abf7b3cec79)
+
+```css
+html[data-theme="dark"] {
+  --color-fill: 33, 39, 55;
+  --color-text-base: 234, 237, 243;
+  --color-accent: 235, 63, 211;
+  --color-card: 52, 63, 96;
+  --color-card-muted: 125, 79, 124;
+  --color-border: 100, 36, 81;
+}
+```