adds forge support, fixes some critical errors

lib/modrinth.ts

@@ -74,6 +74,13 @@ export type ModrinthProject = {
   monetization_status: string;
 };
 
+export type ModrinthGameVersion = {
+  version: string;
+  version_type: string;
+  data: string;
+  major: boolean;
+}
+
 export class Modrinth {
   static apiRoot = "https://api.modrinth.com/v2";
 
@@ -109,4 +116,9 @@ export class Modrinth {
     const res = await fetch(this.apiRoot + "/project/" + id);
     return await res.json() as ModrinthProject;
   }
+
+  static async getGameVersions() {
+    const res = await fetch(this.apiRoot + '/tag/game_version');
+    return await res.json() as ModrinthGameVersion[];
+  }
 }