Generate PrebidMobile Documentation

[OlenaPostindustria]

Closes #990

API reference is here: https://docs.prebid.org/prebid-mobile-ios/index.html

[bretg]

Thanks for checking the docs_new directory size. Does this generate docs on every commit, on merge to master, or on release? I would think that on-release is what we'd want.

I propose that we merge this when happy, then wait for a release to happen to test the update script before placing the links around docs.prebid.org.

[OlenaPostindustria]

Does this generate docs on every commit, on merge to master, or on release? I would think that on-release is what we'd want.

Documentation generation starts when a tag is pushed(f.e., 1.0.0), so it happens on release.

[YuriyVelichkoPI]

LGTM

[bretg]

My review was limited to the workflow script. My take is this can be released when ready. We're not going to link to the results until after the next SDK release after confirming the release did the right thing to the documentation repo.

thanks!