Clean up unnecessary icons

Created by: benvenker

We show some icons that feel redundant, like a file icon when viewing what is obviously a match in the file contents:

We also show both an “S” icon identifying a result as a symbol type but then also include an icon for the type of symbol it is:

Other feedback from @novoselrok and @fkling: @novoselrok:

I find our symbol icons, in general, very hard to parse. I prefer GitHub's way of having the symbol initials with different colors as the icon. E.g. fn for functions, class for classes, etc

@fkling

Same. The icons are not self-explanatory so you'd have to learn them. Using (some form of) type name would make it easier for people to "get into it". I also like how GitHub prefixes symbols with different colored type names.