Improve note search

[thecodrr]

Note search currently uses a traditional search input which is not the most intuitive or useful way to search for a couple of reasons:

1. It is cumbersome to search long notes
2. It appears over the text (below the toolbar) blocking a couple of lines
3. It's hard to use because everything is clustered in a single horizontal line

In light of these reasons, we are introducing a new search UI that looks somewhat like this:

There are a few main goals behind this radical change:

1. User shouldn't be afraid to search i.e., search should be so intuitive that users reach out for it
2. It should be easy to navigate & jump to a specific result
3. Search should give a quick overview over all the results without having to scroll through the entire note
4. Selectively replacing items should be possible