feat: add bookmarklet to load hidden conversations on github

Author: isqua

src/bm/github/load-hidden-conversations.js

@@ -0,0 +1,3 @@
+Array.from(document.querySelectorAll('button[type="submit"'))
+    .filter(b => b.textContent.includes('hidden conversation'))
+    .forEach(b => b.click())

src/index.json

@@ -66,6 +66,17 @@
             }
         ]
     },
+    {
+        "name": "Github",
+        "id": "github",
+        "content": [
+            {
+                "name": "Load all hidden conversations",
+                "id": "load-hidden-conversations",
+                "text": "If there’re many comments in Github Pull Request, some of them are hidden under the “Load more” button. This bookmarklet loads all these hidden comments"
+            }
+        ]
+    },
     {
         "name": "Codewars.com",
         "id": "codewars",