[doc mv] `sw/` doc files moved for new layout.

No file has been modified, so that git can more easily track moved files.

Signed-off-by: Hugo McNally <hugo.mcnally@gmail.com>
Co-authored-by: Harry Callahan <hcallahan@lowrisc.org>
Co-authored-by: James Wainwright <james.wainwright@lowrisc.org>
diff --git a/sw/_index.md b/sw/README.md
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diff --git a/sw/device/_index.md b/sw/device/README.md
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diff --git a/sw/device/lib/_index.md b/sw/device/lib/README.md
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diff --git a/sw/device/lib/testing/_index.md b/sw/device/lib/testing/README.md
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diff --git a/sw/device/lib/testing/test_framework/index.md b/sw/device/lib/testing/test_framework/README.md
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diff --git a/sw/device/silicon_creator/_index.md b/sw/device/silicon_creator/README.md
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diff --git a/sw/device/silicon_creator/manuf/doc/index.md b/sw/device/silicon_creator/manuf/README.md
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diff --git a/sw/device/silicon_creator/rom/docs/_index.md b/sw/device/silicon_creator/rom/README.md
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diff --git a/sw/device/silicon_creator/rom/docs/memory_protection.md b/sw/device/silicon_creator/rom/doc/memory_protection.md
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diff --git a/sw/device/silicon_creator/rom/docs/module.md.tpl b/sw/device/silicon_creator/rom/doc/module.md.tpl
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diff --git a/sw/device/silicon_creator/rom_ext/docs/manifest.md b/sw/device/silicon_creator/rom_ext/doc/manifest.md
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diff --git a/sw/device/tests/index.md b/sw/device/tests/README.md
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diff --git a/sw/host/_index.md b/sw/host/README.md
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