Update to 1812 on webpage
Various places on the webpage you still refer to v1806, e.g.:
https://www.openfoam.com/code/repositories.php
https://www.openfoam.com/code/build-guide.php
https://www.openfoam.com/documentation/system-requirements.php
Further, it would be convenient if the ThirdParty-xxx source could also be provided via gitlab.