style(pages): improve referral page presentation and menu configuration

Update referral page with professional English title, description, and semantic link icon. Simplify aliases and adjust menu weight for better navigation positioning. Also update pages menu weight for consistent layout.

content/page/pages/index.md

@@ -3,6 +3,7 @@ title: Pages
 description: Danh sách pages đã làm
 menu:
   main:
+    weight: -40
     params:
       icon: list
 ---

content/page/referral/index.md

@@ -1,16 +1,15 @@
 ---
 title: Referral
-description: Danh sách lời mời services của mình
+description: Referral links for tech services I use
 aliases:
-  - referral
   - invite
 menu:
   main:
-    weight: -90
+    weight: -30
     params:
-      icon: user
+      icon: link
 ---
 
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