Allow whitespace or a forward slash with keyword

[simonsickle]

For my use case, I would like to make a quick search with a the forward slash to match what my org does in their chrome extension.

For example: a test is the same as a/test now, both search amazon for "test". In chrome I would type something like action/somewhere so I have muscle memory here and that is the only driving force for this change (and the fact I want to use your extension on my ipad/phone/work computer and have my work quick links working)

[simonsickle]

@arnemart do you have any objections to this PR? Pinging you in case you missed it