remove root Makefile and get rid of cd in drone ci

[wkloucek]

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[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[phil-davis]

Looks OK.
Note: The test-acceptance-api make target and related code... is in ocis/Makefile already. So this PR reduces duplication by removing the root Makefile

[phil-davis]

Will this change the way to run acceptance tests? And maybe other things?
For example, instructions in https://github.com/owncloud/ocis/blob/master/docs/ocis/development/testing.md will need updating in this PR.

[wkloucek]

Will this change the way to run acceptance tests? And maybe other things?
For example, instructions in https://github.com/owncloud/ocis/blob/master/docs/ocis/development/testing.md will need updating in this PR.

I added a hint to the referenced testing docs.

There are tons of things to improve or even correct the docs, but I see this as out of scope for this PR. There is more progress going on like in #874

[phil-davis]

There are tons of things to improve or even correct the docs, but I see this as out of scope for this PR

Yes, agree. Just make whatever changes are "obviously" needed because of this PR.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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