add percentile rank icon (#2859)

* feat: add 'percentile' rank icon

This commit adds the `percentile` option for the `rank_icon` query
variable. This option displays the rank percentile the user belongs to.

* style: improve percentile rank icon styling

* dev

* dev

* dev

---------

Co-authored-by: Alexandr <qwerty541zxc@gmail.com>

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
     "markdown.extension.toc.levels": "1..3",
     "editor.formatOnSave": true,
-    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.defaultFormatter": "esbenp.prettier-vscode" 
 }