DOCS-1474: moving server status documentation to command reference page
Update: Clarifying the capabilities of the UserAdmin role

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1474: fixing links
server-status file renaming indecision
minor: fixing side bar
DOCS-1449: fixing reference landing page rendering
command descriptions for six include files

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: typo fix
DOCS-1449 edits