Revert Trac documentation removal
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I feel the GitLab migration documentation belongs there, and could be helpful to not pretend Trac never existed... This reverts commit: 6a447183876eb6332e44b8f8038ae138d58f7e96 remove link to dead trac page 1735010a92170936927d4949ef735e1ae7f50fdd remove trac documentation now that it is retired