Update doc links to relative markdown files

[shoumikhin]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10164

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As of commit 2f51112 with merge base 85485b8 ():
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[shoumikhin]

@pytorchbot cherry-pick --onto release/0.6 -c docs

[pytorchbot]

Cherry picking #10164

Command git -C /home/runner/work/executorch/executorch cherry-pick -x -X theirs 39274d855a768d921495aee7854a30b432dde4b8 returned non-zero exit code 1

Auto-merging CONTRIBUTING.md
CONFLICT (modify/delete): docs/source/build-run-openvino.md deleted in HEAD and modified in 39274d855 (Update doc links to relative markdown files (#10164)).  Version 39274d855 (Update doc links to relative markdown files (#10164)) of docs/source/build-run-openvino.md left in tree.
Auto-merging docs/source/new-contributor-guide.md
Auto-merging docs/source/using-executorch-ios.md
Auto-merging examples/demo-apps/android/LlamaDemo/docs/delegates/mediatek_README.md
Auto-merging examples/demo-apps/apple_ios/LLaMA/docs/delegates/mps_README.md
Auto-merging examples/demo-apps/apple_ios/LLaMA/docs/delegates/xnnpack_README.md
error: could not apply 39274d855... Update doc links to relative markdown files (#10164)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

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