Fix dead links and drop description for logo

The text under the logo is too much, and is repeated in the leading
paragraph right next to it.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

_config.yml

@@ -6,7 +6,7 @@ plugins:
 - jekyll-remote-theme
 
 #title: KernelKit
-description: Infix, a Network Operating System
+#description: Infix, a Network Operating System
 logo: /assets/img/logo.png
 favicon: true
 show_downloads: false
@@ -30,7 +30,7 @@ doc:
     link: https://github.com/kernelkit/infix/blob/main/doc/branding.md
   - name: CLI Tutorial
     icon: <i class="fa-solid fa-terminal"></i>
-    link: https://github.com/kernelkit/infix/blob/main/doc/cli/tutorial.md
+    link: https://github.com/kernelkit/infix/tree/main/doc/cli
   - name: Containers in Infix
     icon: <i class="fa-brands fa-docker"></i>
     link: https://github.com/kernelkit/infix/blob/main/doc/container.md
@@ -43,9 +43,6 @@ doc:
   - name: Networking Lego®
     icon: <i class="fa-solid fa-network-wired"></i>
     link: https://github.com/kernelkit/infix/blob/main/doc/networking.md
-  - name: Infix Variants
-    icon: <i class="fa-solid fa-mercury"></i>
-    link: https://github.com/kernelkit/infix/blob/main/doc/variant.md
   - name: Testing
     icon: <i class="fa-solid fa-vial"></i>
     link: https://github.com/kernelkit/infix/blob/main/doc/testing.md