Chore: embed yyjson source code

Ref: https://github.com/fastfetch-cli/fastfetch/discussions/523

src/3rdparty/yyjson/repo.json

@@ -0,0 +1,6 @@
+{
+    "home": "https://github.com/ibireme/yyjson",
+    "license": "MIT ( embed in source )",
+    "version": "5e3b26d2659287d31e2f8e10f95f95feb7e5ab3a",
+    "author": "ibireme"
+}

src/detection/terminalfont/terminalfont.c

@@ -62,7 +62,6 @@ FF_MAYBE_UNUSED static void detectTTY(FFTerminalFontResult* terminalFont)
 #include "common/processing.h"
 
 #include <stdlib.h>
-#include <yyjson.h>
 
 static const char* detectWTProfile(yyjson_val* profile, FFstrbuf* name, double* size)
 {

src/fastfetch.h

@@ -7,7 +7,8 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include <yyjson.h>
+
+#include "3rdparty/yyjson/yyjson.h"
 
 #include "util/FFstrbuf.h"
 #include "util/FFlist.h"