remove aoc solutions

examples/euler/euler_07.zr

@@ -0,0 +1,11 @@
+func main[] : i64
+    found := 0
+
+    i := 1
+    while true
+        if i->is_prime()
+            found += 1
+            if found == 10001
+                io.println_i64(i)
+                break
+        i += 1