office: Add option to reconstruct/show thread in neomutt

Added zr mapping to try to reconstruct a thread that has been ripped
apart, as well as zR mapping to simply show (only) the current thread in
neomutt.

office/.config/neomutt/maps

@@ -28,6 +28,8 @@ bind pager,index    gt next-thread
 bind pager,index    gT previous-thread
 bind pager,index    za collapse-thread
 bind pager,index    zA collapse-all
+bind pager,index    zr reconstruct-thread
+bind pager,index    zR entire-thread
 
 # Email completion bindings
 bind editor <Tab> complete-query