Add trailing slash to items in the website menu

A missing trailing slash causes a extra redirect to the page with
a trailing slash. It also fixes some for the errors reported by the link
checker in getporter#3027.

Signed-off-by: Kim Christensen <kimworking@gmail.com>

docs/hugo.toml

@@ -45,37 +45,37 @@ enableInlineShortcodes= true
 # Docs Navigation
 [[menu.main]]
 name = "Install"
-url = "/docs/getting-started/install-porter"
+url = "/docs/getting-started/install-porter/"
 identifier = "install-porter"
 weight = 1
 
 [[menu.main]]
 name = "QuickStart"
-url = "/docs/quickstart"
+url = "/docs/quickstart/"
 identifier = "quickstart"
 weight = 2
 
 [[menu.main]]
 name = "Blog"
-url = "/blog"
+url = "/blog/"
 identifier = "blog"
 weight = 3
 
 [[menu.main]]
 name = "Community"
-url = "/community"
+url = "/community/"
 identifier = "community"
 weight = 4
 
 [[menu.main]]
 name = "Learning"
-url = "/docs/learn"
+url = "/docs/learn/"
 identifier = "learn"
 weight = 5
 
 [[menu.main]]
 name = "Docs"
-url = "/docs"
+url = "/docs/"
 identifier = "docs"
 weight = 6