Hovering on level reveals some information about how to approach the level

[shishir610]

Description:
While hovering on any level, some information such as align-item or justify-content is revealed which compromises the need to have intermediate and expert difficulties

Steps to recreate issue:

1. Go to https://flexboxfroggy.com/
2. Click on the Levels dropdown
3. Hover on any level

Ideal behaviour:
We should not display anything after hovering the level button.

[thomaspark]

@shishir610, thanks for the issue. We'll hide the level tooltips at intermediate and expert difficulty.