[FEATURE] Add ability to search for both the user name and scratch name

[katlyn-edwards]

Describe the bug I'd like to search for all scratches by user "X" with the name prefixed "Y"

To Reproduce Steps to reproduce the behavior:

1. Search for "X Y" in the search box
2. See no results
3. See results for searching "X" or "Y" independently

Expected behavior Search should be tokenized to allow me to search across multiple attributes.

[mkst]

Maybe we could do something like user:mkst foo or platform:n64 bar or preset:mario baz ?