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

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

`util/_index.md` was deleted as `doc/rm/_index.md`
was a better starting point for a `util` overview/summary.

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/doc/rm/_index.md b/util/README.md
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diff --git a/util/_index.md b/util/_index.md
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@@ -1,11 +0,0 @@
----
-title: "Utilities"
----
-
-This is the landing spot for utility script documentation within the OpenTitan project.
-Primarily these are README files about tooling scripts used to generate technical content.
-More description and information can be found within the [Reference Manual]({{< relref "doc/rm" >}}) and [User Guide]({{< relref "doc/ug" >}}) areas.
-
-## Utility READMEs
-
-{{% sectionContent %}}
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diff --git a/doc/rm/crossbar_tool/index.md b/util/tlgen/README.md
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