Demos: Remove "RetroFetch"

We should just get good enough to run "neofetch" or something like that
instead of having this half-baked thing.

Demos/RetroFetch/Makefile

@@ -1,21 +0,0 @@
-include ../../Makefile.common
-
-OBJS = main.o
-
-APP = RetroFetch
-
-DEFINES += -DUSERLAND
-
-all: $(APP)
-
-$(APP): $(OBJS)
-	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) -lc
-
-.cpp.o:
-	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
-
--include $(OBJS:%.o=%.d)
-
-clean:
-	@echo "CLEAN"; rm -f $(APP) $(OBJS) *.d
-

Demos/RetroFetch/main.cpp

@@ -1,70 +0,0 @@
-#include <AK/Assertions.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-static void moveto(int row, int column)
-{
-    printf("\033[%d;%dH", row, column);
-    fflush(stdout);
-}
-
-int main()
-{
-    printf("\033[3J\033[H\033[2J");
-    fflush(stdout);
-    int fd = open("/res/serenity.ansi.txt", O_RDONLY);
-    if (fd < 0) {
-        perror("open");
-        return 0;
-    }
-    for (;;) {
-        char buffer[BUFSIZ];
-        int nread = read(fd, buffer, sizeof(buffer));
-        if (nread < 0) {
-            perror("read");
-            return 1;
-        }
-        if (nread == 0)
-            break;
-        int nwritten = write(STDOUT_FILENO, buffer, nread);
-        if (nwritten < 0) {
-            perror("write");
-            return 1;
-        }
-        ASSERT(nwritten == nread);
-    }
-    close(fd);
-
-    printf("\n");
-    printf("\033[s");
-
-    char hostname[128];
-    int rc = gethostname(hostname, sizeof(hostname));
-    if (rc < 0) {
-        perror("gethostname");
-        return 1;
-    }
-
-    int column = 42;
-
-    moveto(3, column);
-    printf("%s@%s\n", getlogin(), hostname);
-
-    moveto(4, column);
-    printf("\033[34;1mOS:\033[0m Serenity\n");
-
-    moveto(5, column);
-    printf("\033[34;1mKernel:\033[0m ");
-    fflush(stdout);
-    system("uname -nrm");
-
-    moveto(6, column);
-    printf("\033[34;1mUptime:\033[0m ");
-    fflush(stdout);
-    system("uptime");
-
-    printf("\033[u\n");
-    return 0;
-}