add tool :monitor command, mostly to test that CNAME works after update

Author: tgrall

docs/tools/index.mdx

@@ -93,6 +93,12 @@ Find the best Graphical User Interfaces to interact with your data and, manage a
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@@ -104,6 +110,5 @@ Find the best Graphical User Interfaces to interact with your data and, manage a
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