Revert README.md links
Revert README.md links


Former-commit-id: 0b92691bacfc130ebf3a4fae6063c55f586f6ef1 [formerly 6d1b7c1094fe32a6011e411e2ae8fab9d4631636]
Former-commit-id: 1f51a95aa6b878dea10accef4d1bf394d093fee4
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine