Copybara import of the project:
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2e10911a56f8478d6c4e10030dea1db8a52e0c12 by Avital Oliver <avitalo@google.com>:
Delete old examples/, rename linen_examples/ -> examples/
Keep the old LM1b example as examples/lm1b_deprecated, until #567
is resolved, per @levskaya's plan.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/flax/pull/884 from avital:remove-examples-take-2 2e10911a56f8478d6c4e10030dea1db8a52e0c12
PiperOrigin-RevId: 352540597
