move GH related files to .github folder #1460

All 623 tests pass, 2 skipped in 4m 7s

    1 files ±0 235 suites ±0 4m 7s ⏱️ ±0s
625 tests ±0 623 ✔️ ±0 2 💤 ±0 0 ❌ ±0
628 runs ±0 626 ✔️ ±0 2 💤 ±0 0 ❌ ±0

Results for commit f2578fe. ± Comparison against earlier commit 57e7673.