meta: Remove kitty overlay

Not needed anymore since kitty 0.29.0 was released.

overlays/kitty.nix

@@ -1,9 +0,0 @@
-{
-  nixpkgs.overlays = [
-    (final: prev: {
-      kitty = prev.kitty.overrideAttrs (old: {
-        patches = (old.patches or [ ]) ++ [ ../patches/kitty-fix-duplicate-lines.patch ];
-      });
-    })
-  ];
-}

patches/kitty-fix-duplicate-lines.patch

@@ -1,40 +0,0 @@
-From 7f6f1f9a5dac301b9f977e0d1a53c487c5cad9aa Mon Sep 17 00:00:00 2001
-From: Kovid Goyal <kovid@kovidgoyal.net>
-Date: Sun, 28 May 2023 06:24:49 +0530
-Subject: [PATCH] Fix a regression in 0.28.0 that caused a buffer overflow when
- clearing the screen
-
-Fixes #6306
-Fixes #6308
----
- docs/changelog.rst | 2 ++
- kitty/screen.c     | 3 ++-
- 2 files changed, 4 insertions(+), 1 deletion(-)
-
-diff --git a/docs/changelog.rst b/docs/changelog.rst
-index b8c9a049e8..12f9806fa2 100644
---- a/docs/changelog.rst
-+++ b/docs/changelog.rst
-@@ -71,6 +71,8 @@ Detailed list of changes
- 
- - Graphics: Move images up along with text when the window is shrunk vertically (:iss:`6278`)
- 
-+- Fix a regression in 0.28.0 that caused a buffer overflow when clearing the screen (:iss:`6306`, :pull:`6308`)
-+
- 0.28.1 [2023-04-21]
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- 
-diff --git a/kitty/screen.c b/kitty/screen.c
-index ffa0e9f94d..a73e4084e3 100644
---- a/kitty/screen.c
-+++ b/kitty/screen.c
-@@ -894,7 +894,8 @@ cursor_within_margins(Screen *self) {
- static void
- screen_dirty_line_graphics(Screen *self, unsigned int top, unsigned int bottom) {
-     bool need_to_remove = false;
--    for (unsigned int y = top; y <= bottom; y++) {
-+    bottom = MIN(bottom+1, self->lines);
-+    for (unsigned int y = top; y < bottom; y++) {
-         if (self->linebuf->line_attrs[y].has_image_placeholders) {
-             need_to_remove = true;
-             linebuf_mark_line_dirty(self->linebuf, y);