Add link to extensions repo

app/src/main/java/eu/kanade/tachiyomi/ui/more/AboutController.kt

@@ -121,6 +121,15 @@ class AboutController : SettingsController() {
                     startActivity(intent)
                 }
             }
+            preference {
+                titleRes = R.string.label_extensions
+                val url = "https://github.com/inorichi/tachiyomi-extensions"
+                summary = url
+                onClick {
+                    val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+                    startActivity(intent)
+                }
+            }
             preference {
                 titleRes = R.string.licenses