Update ios-app.md
Update ios-app.md

Move from git_repository to http_archive and add more details to the documentation.

Will update bazelbuild/examples with https://github.com/bazelbuild/examples/pull/44

Closes #3968.

PiperOrigin-RevId: 176113916

bazelbuild/bazel,dropbox/bazel,ulfjack/bazel,ButterflyNetwork/bazel,perezd/bazel,dropbox/bazel,perezd/bazel,dslomov/bazel-windows,dropbox/bazel,davidzchen/bazel,dropbox/bazel,dslomov/bazel-windows,safarmer/bazel,cushon/bazel,ButterflyNetwork/bazel,cushon/bazel,werkt/bazel,meteorcloudy/bazel,davidzchen/bazel,bazelbuild/bazel,akira-baruah/bazel,twitter-forks/bazel,davidzchen/bazel,akira-baruah/bazel,katre/bazel,davidzchen/bazel,dslomov/bazel-windows,akira-baruah/bazel,dslomov/bazel,werkt/bazel,ulfjack/bazel,katre/bazel,werkt/bazel,safarmer/bazel,perezd/bazel,katre/bazel,perezd/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,davidzchen/bazel,akira-baruah/bazel,aehlig/bazel,safarmer/bazel,ulfjack/bazel,aehlig/bazel,dslomov/bazel,perezd/bazel,dropbox/bazel,dslomov/bazel-windows,dslomov/bazel,ButterflyNetwork/bazel,davidzchen/bazel,meteorcloudy/bazel,dslomov/bazel,dslomov/bazel,bazelbuild/bazel,perezd/bazel,twitter-forks/bazel,akira-baruah/bazel,dslomov/bazel,ulfjack/bazel,aehlig/bazel,twitter-forks/bazel,safarmer/bazel,katre/bazel,safarmer/bazel,akira-baruah/bazel,twitter-forks/bazel,aehlig/bazel,ButterflyNetwork/bazel,dropbox/bazel,dslomov/bazel-windows,ulfjack/bazel,ulfjack/bazel,werkt/bazel,twitter-forks/bazel,dslomov/bazel-windows,safarmer/bazel,cushon/bazel,aehlig/bazel,ulfjack/bazel,cushon/bazel,katre/bazel,meteorcloudy/bazel,meteorcloudy/bazel,cushon/bazel,dslomov/bazel,werkt/bazel,bazelbuild/bazel,cushon/bazel,aehlig/bazel,bazelbuild/bazel,twitter-forks/bazel,twitter-forks/bazel,katre/bazel,meteorcloudy/bazel,werkt/bazel,aehlig/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,perezd/bazel,davidzchen/bazel