feat: changelogs

docs/changelogs/1.15.3.md

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+# Blitzkrieg 1.15.3
+
+The bot now gets more expressive!
+
+## Features
+
+- The bot can now have presence messages; examples:
+  - "Living in <number> servers"
+  - "Server <number> users"
+  - "Observing <number> channels"
+  - More will be added in the future! Give me some ideas
+
+## Changes
+
+- Moved `/credits` to `/about creators`
+- `/debug` command now ditches embeds and has better information to serve
+
+## Technical Changes
+
+- Removed manual trigger for Asian latest ratings leaderboard archiver
+- Leaderboard archiver now accepts an explicit target like `midnight` or `latest`
+- Combined midnight and latest leaderboard archival workflow into one file