install Azure CLI
https://docs.microsoft.com/en-us/cli/azure/install-azure-cli
install devops extension
az extension add --name azure-devops
move to local project (the remote will be taken from .git directory)
cd C:\...\Workspaces\DevOps\ProjectName
auth
az login
get repository ID from id attribute (wiki has its own repo)
az devops wiki list
delete wiki
az repos delete --id af610cde-6c7c-40ba-8f59-d04b0f1ca51b
open AzureDevOps WIKI and select "publish as a code" option