x11/kitty: kitty.conf(5) manual page improvement

Add an OVERVIEW section to that manpage, so that the NAME section has
only few words. See for example the output when visiting

https://man.freebsd.org/cgi/man.cgi?query=kitty.conf&apropos=1

Current rendering:

https://user-images.githubusercontent.com/192271/260857832-927f7a50-a95a-4fb0-9092-d39d0e52f1b1.png

PR:		273248
Reported by:	Graham Perrin <grahamperrin@gmail.com>

x11/kitty/files/patch-docs_conf.py

@@ -1,5 +1,14 @@
---- docs/conf.py.orig	2023-05-12 12:26:28 UTC
+--- docs/conf.py.orig	2023-08-26 07:33:11 UTC
 +++ docs/conf.py
+@@ -177,7 +177,7 @@ manpages_url = 'https://man7.org/linux/man-pages/man{s
+ # (source start file, name, description, authors, manual section).
+ man_pages = [
+     ('invocation', 'kitty', 'kitty Documentation', [author], 1),
+-    ('conf', 'kitty.conf', 'kitty.conf Documentation', [author], 5)
++    ('conf', 'kitty.conf', 'kitty terminal emulator configuration file', [author], 5)
+ ]
+
+
 @@ -207,18 +207,10 @@ def commit_role(
      name: str, rawtext: str, text: str, lineno: int, inliner: Any, options: Any = {}, content: Any = []
  ) -> Tuple[List[nodes.reference], List[nodes.problematic]]:

x11/kitty/files/patch-docs_conf.rst

@@ -0,0 +1,18 @@
+--- docs/conf.rst.orig	1979-11-29 23:00:00 UTC
++++ docs/conf.rst
+@@ -1,7 +1,14 @@
+ kitty.conf
+------------------------
++================
+
+ .. highlight:: conf
++
++
++.. only:: man
++
++    Overview
++    --------------
++
+
+ |kitty| is highly customizable, everything from keyboard shortcuts, to rendering
+ frames-per-second. See below for an overview of all customization possibilities.