Change onboarding ownership to reflect reality
Update joiners and leavers process
Remove tenderapp, update KYC
Revert "Update onboarding.rst"

This reverts commit 6cb18724222d6b9e7c188864516713b59395b8ea.
Revert "Added fiona"

This reverts commit 0eff8476de6ab9ee78fca08f1d868c2f76930dd8.
Merge branch 'onboarding-leavers-process'