Removing the VIM browse patch.

The general reasoning is that the vim browse patch is very invasive,
has a high level of complexity, and is incompatible with a significant
number of other patches and it complicates further maintenance.

Additionally the patch has its own scrollback mechanism which seemingly
did not work properly - and nobody seems to have complained about this
since the patch was added back in May 2021.

If you want to try out the vim browse patch then I would recommend having
a play around with the patch author's own build that has this patch
integrated:
   - https://github.com/juliusHuelsmann/st-history-vim
   - https://github.com/juliusHuelsmann/st

Alternatively a tag has been added to this repository that refers to the
last commit that still has the vim browse patch:
   - https://github.com/bakkeby/st-flexipatch/tree/VIM_BROWSE_PATCH

config.def.h

@@ -222,24 +222,6 @@ unsigned int selectionbg = 259;
 static int ignoreselfg = 1;
 #endif // SELECTION_COLORS_PATCH
 
-#if VIM_BROWSE_PATCH
-unsigned int const currentBg = 6, buffSize = 2048;
-/// Enable double / triple click yanking / selection of word / line.
-int const mouseYank = 1, mouseSelect = 0;
-/// [Vim Browse] Colors for search results currently on screen.
-unsigned int const highlightBg = 160, highlightFg = 15;
-char const wDelS[] = "!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", wDelL[] = " \t";
-char *nmKeys [] = {              ///< Shortcusts executed in normal mode
-  "R/Building\nN", "r/Building\n", "X/juli@machine\nN", "x/juli@machine\n",
-  "Q?[Leaving vim, starting execution]\n","F/: error:\nN", "f/: error:\n", "DQf"
-};
-unsigned int const amountNmKeys = sizeof(nmKeys) / sizeof(*nmKeys);
-/// Style of the {command, search} string shown in the right corner (y,v,V,/)
-Glyph styleSearch = {' ', ATTR_ITALIC | ATTR_BOLD_FAINT, 7, 16};
-Glyph style[] = {{' ',ATTR_ITALIC|ATTR_FAINT,15,16}, {' ',ATTR_ITALIC,232,11},
-                 {' ', ATTR_ITALIC, 232, 4}, {' ', ATTR_ITALIC, 232, 12}};
-#endif // VIM_BROWSE_PATCH
-
 #if BLINKING_CURSOR_PATCH
 /*
  * https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps-SP-q.1D81
@@ -456,9 +438,6 @@ static Shortcut shortcuts[] = {
 	#if INVERT_PATCH
 	{ TERMMOD,              XK_X,           invert,          { 0 } },
 	#endif // INVERT_PATCH
-	#if VIM_BROWSE_PATCH
-	{ MODKEY,               XK_c,           normalMode,      {.i =  0} },
-	#endif // VIM_BROWSE_PATCH
 };
 
 /*