Migrate to pytorch_sphinx_theme2

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14704

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❌ 6 New Failures, 11 Pending

As of commit 21749c5 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9bf5cb520d2c99ccd0b2a394fce7547c52db0dc70d2ac9be68738d05fa3ca83c /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / unittest-nxp-neutron / linux-job (gh)
  test_split_group_convolution__2d_1_group_3

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