[urlcheck] Add more to whitelist.

Jenkinsfile

@@ -801,7 +801,7 @@ pipeline {
           }
           steps {
             dir('web') {
-              sh 'urlchecker check --file-types .pandoc,.md --white-listed-files releases/* --white-listed-urls https://jenkins.opengeosys.org/job/ufz/job/ogs-container-maker/job/master/build,http://yourproxy.example.com,https://apt.kitware.com/ubuntu/,https://github.com/YOUR-USERNAME/ogs,https://jenkins.opengeosys.org/github-webhook/,http://localhost:1313,https://github.com/ufz/ogs/pull/$1,http://www.opengeosys.org/images/xsd/OpenGeoSysXXX.xsd content'
+              sh 'urlchecker check --file-types .pandoc,.md --white-listed-files releases/* --white-listed-urls https://jenkins.opengeosys.org/job/ufz/job/ogs-container-maker/job/master/build,http://yourproxy.example.com,https://apt.kitware.com/ubuntu/,https://github.com/YOUR-USERNAME/ogs,https://jenkins.opengeosys.org/github-webhook/,http://localhost:1313,https://github.com/ufz/ogs/pull/\$1,http://www.opengeosys.org/images/xsd/OpenGeoSysXXX.xsd,https://`-protocol content'
             }
           }
         }

web/content/docs/devguide/documentation/introduction.pandoc

@@ -118,7 +118,7 @@ ALGOLIA_WRITE_KEY=XXX node_modules/.bin/hugo-algolia --toml -s
 
 ### Used components
 
-- [Hugo](https://gohugo.com) - Web site generator
+- [Hugo](https://gohugo.io) - Web site generator
 - [Tailwind](https://tailwindcss.com/docs/what-is-tailwind) - CSS framework
 - [FontAwesome](https://fontawesome.com) - Icons, see [icon search](https://fontawesome.com/icons?d=gallery)
 - [Slick Carousel](http://kenwheeler.github.io/slick/) & [FancyBox](https://fancyapps.com/fancybox/3/) for image galleries