Strip discord.ext in genindex page and unbreak PEP links.

docs/_templates/genindex.html

@@ -9,6 +9,14 @@
     // this is pretty finicky but it should work.
     for(let el of elements) {
       let key = el.getAttribute('href').split('#', 2)[1]
+      if(!key.startsWith('discord.')) {
+        continue;
+      }
+
+      if(key.startsWith('discord.ext.')) {
+        key = key.substr(12); // discord.ext.
+      }
+
       if(el.textContent.endsWith('method)') || el.textContent.indexOf('()') !== -1) {
         key = key + '()'
       }