Put link to manuals on the new website [skip ci]
Put link to manuals on the new website [skip ci]


Former-commit-id: 5c2b11bb64a7cc5b86baf227f7d4ae4aa8710ac6 [formerly 6299e68523a9369a9313a0220888636d8c724b31]
Former-commit-id: 60fa29d51fdc22807a24b6e970732028abef4ffd
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine