Move rockydocs_tool_guide.md to "Local Documentation" menu (#2882)

* originally placed in the contribute section directly
* moving it groups it correctly with the other local documentation items
* modified the `.pages` file in the `localdocs` folder, too, to place this item first in the listing

Author: sspencerwire

docs/guides/contribute/localdocs/.pages

@@ -1,6 +1,7 @@
 ---
 nav:
     - ... | index*.md
+    - ... | rockydocs_tool_guide*.md
     - ... | rockydocs_web_dev*.md
     - ... | mkdocs_lsyncd*.md
     - ... | rockydocs_webdev_v2*.md