Update some links to the openquake website
Update some links to the openquake website


Former-commit-id: b81214319f80fc2c4940202f4ce9eb267a4239e7 [formerly b81214319f80fc2c4940202f4ce9eb267a4239e7 [formerly af62d47c943ece3b096ce82ecea286e4485536ab]]
Former-commit-id: b1acbf9c8c5a154fea385092828b54ac9a493f62
Former-commit-id: bf979c44196fe9c36506b33ca4942a369d45cb04
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine