Replace http:// by simply //

This makes the link using the current protocol either http or https
according to the protocol under which the application is deployed.
This prevent any warnings of an https page refering to element
which are http.
Merge pull request #30 from fedora-infra/no_http

Replace http:// by simply //
This should fix the white-on-black theme users
Merge pull request #32 from fedora-infra/feature/fix-textfields-on-white-on-black

This should fix the white-on-black theme users
Merge branch 'develop' into feature/issue-27