docs(): menu-toggle isn't running the open animation correctly.

[devversion]

As you can see in the provided GIF, the open animation won't run after d79ed26

[devversion]

Created a PR, which fixes that issue. Little explanation -

• When opening demo through link (example: http://127.0.0.1:8080/#/demo/bottomSheet), we need to wait for the ul being rendered. (using the next tick)
• So I register the complete watcher in the next tick without affecting the current code.
• The current problem for the open animation is, that we read the height in the timeout, so we need to move that out -> but then it won't wait for the ul to be rendered on opening through link. So as I did, we need to delay the watcher registration - and everything works.