Update README.md

[mmattel]

Update README.md to promote the documentation

While the settings.yml file now contains the correct url to the admin documentation, a prominent placement for doc links in readme was missing - fixed.

[mmattel]

kill bill... 🤣

[phil-davis]

https://drone.owncloud.com/owncloud/ocis/13497/51/8
apiWebdavUploadTUS/uploadToShare.feature:88 failed.
That is a known flaky test that we are in the process of skipping: owncloud/core#40210
I will restart CI.

Actually, I am surprised that all the CI pipelines ran - this PR only changes README.md, so I thought that most of the CI would automatically skip itself.

[mmattel]

kill bill vol 2 🤣

[wkloucek]

Actually, I am surprised that all the CI pipelines ran - this PR only changes README.md, so I thought that most of the CI would automatically skip itself.

./docs is on the skip list, but ./README.md is not. I'm fine with adding it, too ;-)

[phil-davis]

I added the top-level "doc" files to the list for skipping CI, similar to what were listed for core.

Note: for this PR it still runs all CI, because I changed .drone.star

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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