Generate man pages for kitten and all its sub-commands recursively

Fixes #6808

kittens/broadcast/main.py

@@ -160,3 +160,4 @@ elif __name__ == '__doc__':
     cd['usage'] = usage
     cd['options'] = OPTIONS
     cd['help_text'] = help_text
+    cd['short_desc'] = 'Broadcast typed text to kitty windows'

kittens/panel/main.py

@@ -149,3 +149,4 @@ elif __name__ == '__doc__':
     cd['usage'] = usage
     cd['options'] = OPTIONS
     cd['help_text'] = help_text
+    cd['short_desc'] = help_text

kittens/query_terminal/main.py

@@ -258,3 +258,4 @@ elif __name__ == '__doc__':
     cd['usage'] = usage
     cd['options'] = options_spec
     cd['help_text'] = help_text
+    cd['short_desc'] = 'Query the terminal for various capabilities'