Add CI pipeline documentation and enhance syncback architecture

- Introduced a new CI pipeline documentation file outlining steps for auto-fixing formatting, running linters, building, and testing.
- Documented the Rojo syncback architecture, detailing improvements to prevent duplicate file creation and format mismatches.
- Updated syncback logic to ensure existing instances are updated instead of creating duplicates, enhancing project file management.
- Added tests for encoding instances and handling nested children to improve reliability in syncback operations.

rojo-test/serve-tests/api_write_existing/src/EventService/AcidRainEvent.luau

@@ -0,0 +1,5 @@
+-- AcidRainEvent module
+return {
+    name = "AcidRainEvent",
+    duration = 30,
+}

rojo-test/serve-tests/api_write_existing/src/EventService/init.server.luau

@@ -0,0 +1,8 @@
+-- EventService: handles game events
+local EventService = {}
+
+function EventService:Start()
+    print("EventService started")
+end
+
+return EventService