Allow running run-tests script from any cwd

'node website/run-tests.mjs' tries to load node_modules from the wrong
directory. Jasmine also looks for tests in the wrong directory. Fix this
by making Jasmine look in the website directory for specs.

Author: strager

website/run-tests.mjs

@@ -4,10 +4,16 @@
 import Jasmine from "jasmine";
 import colors from "colors";
 import fs from "fs";
+import path from "path";
+import url from "url";
+
+let __filename = url.fileURLToPath(import.meta.url);
+let __dirname = path.dirname(__filename);
 
 function main() {
   let jasmine = new Jasmine();
   jasmine.loadConfig({
+    spec_dir: path.relative("", __dirname),
     spec_files: ["!node_modules/**", "**/test-*.mjs"],
     stopSpecOnExpectationFailure: true,
     random: false,