feat: add portfolio page with projects, open source contributions, and skills

- Created comprehensive portfolio page showcasing featured projects
- Added open source contributions section with links to PRs
- Included technical skills grid with categories
- Added navbar link to portfolio page
- Modern responsive design with gradient accents and hover effects

Author: VedantMadane

_config.yml

@@ -13,7 +13,7 @@ author: Vedant Madane
 
 # --- List of links in the navigation bar --- #
 navbar-links:
-  #CV: "https://vedantmadane.github.io/cv"
+  Portfolio: "https://vedantmadane.github.io/portfolio"
   Projects: 
     - Detect Multiple Faces: "https://vedantmadane.github.io/mkcl/camera/detect/#/"
     - Mahābhārata: "https://vedantmadane.github.io/maha/poster"
@@ -25,12 +25,7 @@ navbar-links:
   Play:
     - Pakshī: "https://vedantmadane.github.io/pakshi/"
     - Dānav: "https://vedantmadane.github.io/krida/danav/"
-    - 
-#    - Poster: "https://vedantmadane.github.io/maha/poster"
-#    - Pre-processing: "https://vedantmadane.github.io/maha"
-#    - Telecom: "https://vedantmadane.github.io/telecom"
   Resume: "https://vedantmadane.github.io/resume/"
-    #- CV:  "https://vedantmadane.github.io/resume/"
   About: "https://vedantmadane.github.io/aboutme"
 #  Resources:
 #    - Beautiful Jekyll: "http://deanattali.com/beautiful-jekyll/"