Add Search Field

[reustle]

Add a search text box in the upper right (not for mobile users). As soon as the user starts typing, show all seasons at the same time, and filter out only episodes where the title matches the string typed. Also, hide the season navigation bar when the user has typed something.

When the search box is clear, show only the selected season again and show the season nav bar.
When the search box is not clear, show a small X on the right side of the input which clears the search text when clicked.