Attempt of fixing the links

Websites.md

@@ -2,7 +2,7 @@
 layout: default
 title: Webistes
 order: 3
-permalink: /websites
+permalink: /websites/
 ---
 
 Websites hosted within the R3lab frame.

frozen.md

@@ -2,7 +2,7 @@
 layout: default
 title: Frozen Pages
 order: 2
-permalink: /frozen
+permalink: /frozen/
 ---
 
 Here you can find project pages that are related to a published scientific paper. Project pages must link to all components referenced in the paper and is not modified after the release of the paper.

index.md

@@ -5,7 +5,7 @@
 layout: default
 title: Index
 order: 1
-permalink: /index
+permalink: /index/
 ---
 
 # Reproducibility