Fix run link implementation

Author: slowcheetah

website/src/js/hljs-run.js

@@ -1,6 +1,7 @@
 export default class RunButtonPlugin {
+  ORIGIN = globalThis.location.origin;
   PATH = globalThis.location.pathname;
-  BASE_URL = document.querySelector('base')?.getAttribute('href') || globalThis.location.origin;
+  BASE_URL = document.querySelector('base')?.getAttribute('href');
   RELATIVE_PATH = this.PATH.replace(this.BASE_URL, '');
   PLAYGROUND_URL = 'playground';
 
@@ -21,8 +22,9 @@ export default class RunButtonPlugin {
       const urlParams = new URLSearchParams();
       urlParams.set('code', text);
       const hash = urlParams.toString();
-      const version = this.RELATIVE_PATH.startsWith('docs/') ? '' : `${ this.RELATIVE_PATH.split('/')[0] }/`;
-      globalThis.location.href = `${ this.BASE_URL }${ version }${ this.PLAYGROUND_URL }#${ hash }`;
+      const hasVersion = this.RELATIVE_PATH !== '' && !this.RELATIVE_PATH.startsWith('docs/') && !this.RELATIVE_PATH.startsWith('index');
+      const version = hasVersion ? `${ this.RELATIVE_PATH.split('/')[0] }/` : '';
+      globalThis.location.href = `${ this.ORIGIN }${ this.BASE_URL }${ version }${ this.PLAYGROUND_URL }#${ hash }`;
     });
     const wrapper = document.createElement('div');
     wrapper.classList.add('hljs-run');