Refactor: Split portfolio to projects and writings sections, and update content structure

- Renamed 'portfolio' collection to 'projects' in content configuration.
- Introduced a new 'writings' collection with corresponding schema.
- Updated README to reflect changes in content structure and navigation.
- Removed the old portfolio page and added new pages for projects and writings.
- Added multiple new project and writing markdown files with relevant content.
- Updated license year to 2025.
- Enhanced AppHeader for new navigation links.
- Improved ProseImg component styling.

types.ts

@@ -110,18 +110,6 @@ export interface Tag {
 }
 
 export const TAGS: Array<Tag> = [
-  {
-    label: 'Article',
-    icon: 'i-ph-pencil-line-duotone',
-    color: 'red',
-    translation: 'tags.article',
-  },
-  {
-    label: 'Project',
-    icon: 'i-ph-briefcase-duotone',
-    color: 'blue',
-    translation: 'tags.project',
-  },
   {
     label: 'R',
     icon: 'i-vscode-icons-file-type-r',