remove modes patch from stale folder

re export modes patch with `git format-patch`

_STALE_PATCHES/modes.md

@@ -1,34 +0,0 @@
-### Description
-Implement modes, default mode is `NORMAL`
-
-### Example
-
-In the example below, you declare a mode: `BROWSER`, which is activated when you press <kbd>modkey</kbd> + <kbd>b</kbd>. Then, you can press <kbd>f</kbd> to launch `Firefox` and return to the default `NORMAL` mode.
-
-```c
-enum {
-  BROWSER,
-};
-const char *modes_labels[] = {
-  "browser",
-};
-
-static const Key keys[] = {
-  // ...
-  { MODKEY, XKB_KEY_b, entermode, {.i = BROWSER} },
-  // ...
-};
-
-static const Modekey modekeys[] = {
-  /* mode      modifier                  key                 function        argument */
-  { BROWSER, { 0, XKB_KEY_f, spawn, SHCMD("firefox") } },
-  { BROWSER, { 0, XKB_KEY_f, entermode, {.i = NORMAL} } },
-  { BROWSER, { 0, XKB_KEY_Escape, entermode, {.i = NORMAL} } },
-};
-```
-
-### Download
-- [2023-09-11](https://github.com/djpohly/dwl/compare/main...wochap:modes.patch)
-
-### Authors
-- [wochap](https://github.com/wochap)