ntfy

This is a tiny release that fixes a database index issue that caused performance issues on ntfy.sh. It also fixes a bug in the rate visitor logic that caused rate visitors to be assigned to seemingly random topics. Nothing major this time.

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Bug fixes + maintenance:

• Re-add database index idx_topic to the messages table to fix performance issues on ntfy.sh (no ticket, big thanks to @tcaputi for finding this issue)
• Do not set rate visitor for non-eligible topics (no ticket)
• Do not cache config.js (#1098, thanks to @wunter8)