Make it easier to search on right/left equivalents start/end

[redonkulus]

From @src-code via https://github.com/acss-io/acss-site/issues/107

Taken from #247 (comment):

... It certainly seems like we could fix search pretty easily, perhaps by having an additional "searchable name" in the ruleset for such cases. Then you could search for "start" or "right" and still get the same results...