chore: add gray-matter dependency for markdown frontmatter parsing

public/images/people/khaled_youssef/khaled_youssef.md

@@ -2,16 +2,26 @@
 id: khaled_youssef
 name: Khaled Mahmoud Youssef
 rank: 4
-memberships: [tech]
-category: [foundation]
-bio: khaled is a passionate software test engineer with experience in software testing and automation using terratests , cypress and other technologies. And always curious to learn more.   
+memberships:
+  - tech
+category:
+  - foundation
+bio: >-
+  khaled is a passionate software test engineer with experience in software
+  testing and automation using terratests , cypress and other technologies. And
+  always curious to learn more.
 excerpt: Software Test Engineer.
-linkedin: https://www.linkedin.com/in/khaled-mahmoud-youssef-555740180/
-websites: https://threefold.tech
-github: https://github.com/Khaledyoussef24
+linkedin: 'https://www.linkedin.com/in/khaled-mahmoud-youssef-555740180/'
+websites: 'https://threefold.tech'
+github: 'https://github.com/Khaledyoussef24'
 image: ./khaled.jpg
-projects: [threefold_tech]
-countries: [Egypt]
-cities: [Cairo]
+projects:
+  - threefold_tech
+countries:
+  - Egypt
+cities:
+  - Cairo
 private: 0
+title: Software Test Engineer
 ---
+