improve formating of hash rate

src/page.h

@@ -881,14 +881,12 @@ public:
         // perapre network info mstch::map for the front page
         string hash_rate;
 
-        if (testnet || stagenet)
-        {
-            hash_rate = std::to_string(current_network_info.hash_rate) + " H/s";
-        }
-        else
-        {
+        if (current_network_info.hash_rate > 1e6)
             hash_rate = fmt::format("{:0.3f} MH/s", current_network_info.hash_rate/1.0e6);
-        }
+        else if (current_network_info.hash_rate > 1e3)
+            hash_rate = fmt::format("{:0.3f} kH/s", current_network_info.hash_rate/1.0e3);
+        else
+            hash_rate = fmt::format("{:0.3f} H/s", current_network_info.hash_rate);
 
         pair<string, string> network_info_age = get_age(local_copy_server_timestamp,
                                                         current_network_info.info_timestamp);