Fix navbar rel. links

- / vs ''
2 jobs for 4-beta-1 in 2 minutes and 4 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #3196
build_css

00:02:04

failed #3197
pages

00:02:04

 
Name Stage Failure
failed
build_css Test There is an unknown failure, please try again

/usr/bin/ruby2.1 extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.1.0/gems/ffi-1.9.18 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/ffi-1.9.18/gem_make.out
ERROR: Job failed: exit code 1
failed
pages Test There is an unknown failure, please try again

/usr/bin/ruby2.1 extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.1.0/gems/ffi-1.9.18 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/ffi-1.9.18/gem_make.out
ERROR: Job failed: exit code 1