feat: added changelogs

docs/changelogs/1.7.6.md

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+# Blitzkrieg 1.7.6
+
+Public service announcements and a few developer quality-of-life changes.
+
+## Changes
+
+- Added a PSA system
+  - Lets me create announcements without having to release a new update every single time
+- Added fixed choices for tank stats instead of typing in numbers like before
+
+## Technical Changes
+
+- Command executions now return a payload and the executor now fully handles the interaction replies
+- The build script now skips certain steps to speed up building time when building in dev mode