Consolidate references in docs

[shoumikhin]

Stick to the main branch on main and remove .html suffixes where possible

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10175

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[mcr229]

Suggested change

	$(".mobile-menu a:contains('Tutorials')").attr("href", "https://pytorch.org/executorch/mian/index#tutorials-and-examples");
	$(".mobile-menu a:contains('Tutorials')").attr("href", "https://pytorch.org/executorch/main/index#tutorials-and-examples");

[shoumikhin]

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

[pytorchbot]

Cherry picking #10175

Command git -C /home/runner/work/executorch/executorch cherry-pick -x -X theirs 72fefb5b22a8e558ecebd57fdccd1ea99cf52a9c returned non-zero exit code 1

Auto-merging CONTRIBUTING.md
Auto-merging README.md
CONFLICT (modify/delete): backends/openvino/README.md deleted in HEAD and modified in 72fefb5b2 (Consolidate references in docs (#10175)).  Version 72fefb5b2 (Consolidate references in docs (#10175)) of backends/openvino/README.md left in tree.
Auto-merging examples/arm/README.md
Auto-merging examples/demo-apps/apple_ios/LLaMA/docs/delegates/mps_README.md
Auto-merging exir/program/_program.py
CONFLICT (modify/delete): extension/android/README.md deleted in HEAD and modified in 72fefb5b2 (Consolidate references in docs (#10175)).  Version 72fefb5b2 (Consolidate references in docs (#10175)) of extension/android/README.md left in tree.
error: could not apply 72fefb5b2... Consolidate references in docs (#10175)
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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