Merge branch 'fixmkdocs' into 'master'

workaround broken mkdocs builds: OTG0070056

See merge request !79

.gitlab-ci.yml

@@ -17,7 +17,7 @@ variables:
   GIT_SUBMODULE_STRATEGY: recursive
   # If you update these, you may need to update the theme customisations
   MKDOCS_VERSION: '1.2.3'
-  MATERIAL_VERSION: '8.1.9'
+  MATERIAL_VERSION: '8.2.7'
   I18NSTATIC_VERSION: '0.31'
   OKD_SERVER: https://api.paas.okd.cern.ch
   RELEASE_NAME: mkdocs