Add query.gg launch sale banner

[lynnandtonic]

For Mon, May 5th

This PR:

• Changes banner on /query/latest to launch sale banner with countdown
• Removes query.gg banner lower on the page
• Links up check out our official course text
• Changes banner on /query/latest/docs/ to launch sale banner with countdown

Note: The docs callout countdown doesn’t seem to be counting down, could you please take a look at that?

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