Add Halkidiki Map (#799)

## Description:
This PR adds the Halkidiki map. It's a region in Greece with rich
history that is very popular also with tourism.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>
Nikola123

src/client/components/Maps.ts

@@ -28,6 +28,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   DeglaciatedAntarctica: "Deglaciated Antarctica",
   FalklandIslands: "Falkland Islands",
   Baikal: "Baikal",
+  Halkidiki: "Halkidiki",
 };
 
 @customElement("map-display")

src/client/utilities/Maps.ts

@@ -11,6 +11,7 @@ import europe from "../../../resources/maps/EuropeThumb.webp";
 import falklandislands from "../../../resources/maps/FalklandIslandsThumb.webp";
 import faroeislands from "../../../resources/maps/FaroeIslandsThumb.webp";
 import gatewayToTheAtlantic from "../../../resources/maps/GatewayToTheAtlanticThumb.webp";
+import halkidiki from "../../../resources/maps/HalkidikiThumb.webp";
 import iceland from "../../../resources/maps/IcelandThumb.webp";
 import japan from "../../../resources/maps/JapanThumb.webp";
 import knownworld from "../../../resources/maps/KnownWorldThumb.webp";
@@ -72,6 +73,8 @@ export function getMapsImage(map: GameMapType): string {
       return falklandislands;
     case GameMapType.Baikal:
       return baikal;
+    case GameMapType.Halkidiki:
+      return halkidiki;
     default:
       return "";
   }