Organize pages into directories and shorter file names.  Use lower-case
names for directories and capitalized names for files.  This produces a
pleasing sort order in the GitLab Wiki navigation page.

Also rename entry page `CMake.md` to `Home.md` to match GitLab Wiki
conventions.

contrib/modules/FindPARMETIS.md

+[Back](CMake_User_Contributed_Macros "wikilink")
+
+-----
+
+    #
+    # Find the PARMETIS includes and libraries
+    #
+    # ParMETIS is an MPI-based parallel library that implements a variety of algorithms for
+    # partitioning unstructured graphs, meshes, and for computing fill-reducing orderings of
+    # sparse matrices. It can be found at:
+    #   http://www-users.cs.umn.edu/~karypis/metis/parmetis/index.html
+    #
+    # PARMETIS_INCLUDE_DIR - where to find autopack.h
+    # PARMETIS_LIBRARIES   - List of fully qualified libraries to link against.
+    # PARMETIS_FOUND       - Do not attempt to use if "no" or undefined.
+
+    FIND_PATH(PARMETIS_INCLUDE_DIR parmetis.h
+      /usr/local/include
+      /usr/include
+    )
+
+    FIND_LIBRARY(PARMETIS_LIBRARY parmetis
+      /usr/local/lib
+      /usr/lib
+    )
+
+    FIND_LIBRARY(METIS_LIBRARY metis
+      /usr/local/lib
+      /usr/lib
+    )
+
+    IF(PARMETIS_INCLUDE_DIR)
+      IF(PARMETIS_LIBRARY)
+        SET( PARMETIS_LIBRARIES ${PARMETIS_LIBRARY} ${METIS_LIBRARY})
+        SET( PARMETIS_FOUND "YES" )
+      ENDIF(PARMETIS_LIBRARY)
+    ENDIF(PARMETIS_INCLUDE_DIR)
+
+-----
+
+[Back](CMake_User_Contributed_Macros "wikilink")
+
+
+----
+This page was initially populated by conversion from its [original location](https://public.kitware.com/Wiki/CMakeUserFindPARMETIS) in another wiki.