Adding some small features

[maridat47]

Hi! This is my first coding experience like this! I only have played around some local mini-projects, like "Scratch 1.4" modification or "Unity" games.

My little changes:

1. Removed extra underlined space symbol from the link in the footer
2. Added tooltip for "completion xp" that explains its meaning
3. "Recent passes" header now shows obtained cxp for the last 24: old — "recent passes (pass count in the past 24 hours)", new "recent 24 hours (pass count passes for cxp earned cxp)"
4. Added ranked/loved date and beatmap-id copy button to the beatmaps cards in the recommended section
5. Tooltip now hides when you press esc button or click far away