docs: Fix links on homepage not working, fix topbar github link

Author: 0ffz

docs/TOPBAR.md

@@ -1,3 +1,3 @@
-[:brand-github: GitHub](https://github.com/MineInAbyss/geary)
+[:brand-github: GitHub](https://github.com/0ffz/particle-hive)
 
 [:external-link: Run in Browser](https://particles.dvyy.me) { .primary-button }

docs/index.md

@@ -6,15 +6,15 @@ items:
   - title: User guide
     desc: Install and run Particle HIVE
     icon: school
-    url: /usage
+    url: /installation
   - title: Developer docs
     desc: Create custom simulations
     icon: code
     url: /api-usage
-  - title: About
-    icon: info-circle
-    desc: Learn more about this project
-    url: /about
+#  - title: About
+#    icon: info-circle
+#    desc: Learn more about this project
+#    url: /about
 ---
 
 <picture>