mamba, mamba-repoquery: add pages (#9056)

pages/common/mamba-repoquery.md

@@ -0,0 +1,20 @@
+# mamba repoquery
+
+> Efficiently query conda and mamba package repositories and package dependencies.
+> More information: <https://mamba.readthedocs.io/en/latest/user_guide/mamba.html#repoquery>.
+
+- Search for all available versions of a particular package:
+
+`mamba repoquery search {{package_name}}`
+
+- Search for all packages satisfying specific constraints:
+
+`mamba repoquery search {{sphinx<5}}`
+
+- List the dependencies of a package installed in the currently activated environment, in a tree format:
+
+`mamba repoquery depends --tree {{scipy}}`
+
+- Print packages in the current environment that require a particular package to be installed (i.e. inverse of `depends`):
+
+`mamba repoquery whoneeds {{ipython}}`