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.

plugin/src/PatchTree.lua

@@ -222,7 +222,7 @@ function PatchTree.build(patch, instanceMap, changeListHeaders)
 		local parentObject = instance.Parent
 		local parentId = instanceMap.fromInstances[parentObject]
 		local previousId = nil
-		while parentObject do
+		while parentObject and parentId do
 			if knownAncestors[parentId] then
 				-- We've already added this ancestor
 				previousId = parentId