gitignore & config changes

- Add gitignore for vscode folder, dwm executable, output files, and config.h
- Change mod key to super key
- Change terminal from st to alacritty

.gitignore

@@ -0,0 +1,4 @@
+.vscode/
+*.o
+dwm
+config.h

config.def.h

@@ -44,7 +44,7 @@ static const Layout layouts[] = {
 };
 
 /* key definitions */
-#define MODKEY Mod1Mask
+#define MODKEY Mod4Mask		/* Mod1Mask = Alt, Mod4Mask = Super */
 #define TAGKEYS(KEY,TAG) \
 	{ MODKEY,                       KEY,      view,           {.ui = 1 << TAG} }, \
 	{ MODKEY|ControlMask,           KEY,      toggleview,     {.ui = 1 << TAG} }, \
@@ -57,7 +57,7 @@ static const Layout layouts[] = {
 /* commands */
 static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn() */
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
-static const char *termcmd[]  = { "st", NULL };
+static const char *termcmd[]  = { "alacritty", NULL };
 
 static Key keys[] = {
 	/* modifier                     key        function        argument */