Remove manual step in auto-documentation

[johlju]

Details of the problem, bug, or enhancement

When auto-documentation is created in the pipeline, it just generate an artefact that contains the new markdown files. These files must be pushed manually to the wiki repo

git clone https://github.com/PowerShell/xActiveDirectory.wiki.git
# copy files
git push origin

Verbose logs showing the problem (if applicable)

n/a

Suggested solution to the issue

These steps should be done by the pipeline. The problem is that is needs to be done by an account that has permission

remote: Permission to PowerShell/ComputerManagementDsc.wiki.git denied to johlju.
fatal: unable to access 'https://github.com/PowerShell/ComputerManagementDsc.wiki.git/': The requested URL returned error: 403

[johlju]

This is being tracked in issue #142