Return actually empty response when app has not been found

search: Disable fuzzy search for queries containing dots

main: Bring back search by appid

This restores previous behavior where users could search
by appid, e.g. "sugarlabs", and it would bring all sugar
applications.

Add support for Sentry

Use multi-stage Dockerfile

redisearch does not support fuzzy search on strings with whitespace

Use fuzzy matching for generic queries

Return empty array if query didn't return any apps

Handle applications missing screenshots also in RSS feeds