sdk: Add documentation warning of its development stage and drop CI for 3.1

This will give a reader a bit of context and fix the expectations when finding this documentation in the context of Oniro docs.

Related to eclipse/oniro-core/docs#147 (moved) and eclipse/oniro-core/docs#148 (moved)

We also drop CI for 3.1, for now, to lighten a bit the CI load while 3.1 is not the default version.

requested review from @robertd and @idlethread

assigned to @agherzan

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• c550afea - 1 commit from branch eclipse/oniro-core:kirkstone
• 9a343f19 - sdk: Add documentation warning of its development stage

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approved this merge request

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• ea0e0cb7 - sdk: Add documentation warning of its development stage

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• c550afea - 1 commit from branch eclipse/oniro-core:kirkstone
• b93328cb - sdk: Add documentation warning of its development stage

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approved this merge request

enabled an automatic merge when the pipeline for b93328cb succeeds

mentioned in merge request !57 (closed)

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• a1fad174 - sdk: Add documentation warning of its development stage
• 9fbbf1d2 - .gitlab-ci.yml: Disable 3.1 builds temporarily

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changed title from sdk: Add documentation warning of its development stage to sdk: Add documentation warning of its development stage and drop CI for 3.1

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merged