update search component

[MReyna12]

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[MReyna12]

I was able to complete most of the items listed here.

A few notes:

1. I did not add the number of results for each unit. We could probably do it, but you are only supposed to add certain types of content inside of a <button>. I wanted to give it more thought and not rush.
2. I am open to removing or doing something different as far as displaying Teacher Content and Student Content. I opted for including because it is not always obvious.
3. When the Teacher Content Only filtering is turned on, the <div>s that previously held the Student Content still exist in the DOM, but they are empty and don't take up space. If this is not ideal, we could revise the way the accordion is rendered. Wanted to flag in case it is something worth discussing.

Happy to discuss decision-making on any items the reviewer may have questions on.