fix: Support Excalidraw inside scrollable container (#3018)

* refactor: remove position fixed from excalidraw container, modal and stats

* remove unused css

* remove position fixed from toast and scroll to content

* Make excal interactable by fixing offsets and set popover as fixed since position needs to be calculate from viewport  top

* Assign 200px less than height of Excalidraw to the selected shapes actions o UI doesn't overflow

* update changelog, readme and package.json

src/components/Toast.scss

@@ -11,7 +11,7 @@
     left: 50%;
     margin-left: -150px;
     padding: 4px 0;
-    position: fixed;
+    position: absolute;
     text-align: center;
     width: 300px;
     z-index: 999999;