Add notes for code refactoring

Signed-off-by: Fred Boniface <fred@fjla.uk>

UpNext.md

@@ -9,10 +9,19 @@
 * Enable text search for `locationName` on find-code page.
 * Recreate raster logos with the new vector file.
 * Responsive text sizes for boards.
-* Rework details div to include the current station and make all stops a single list.
+* Rework details div to include the current station and make all stops a single list.  The time parsing function needs to work for `et` OR `at`
     - Also include other details from the API such as:
         - Platform number
         - Operator
+* Frontend code refactoring:
+    - Refactor into files:
+        - lib.main.js
+        - lib.board.js
+        - simple-board.js
+        - index.js
+        - settings.js
+        - find-code.js
+        - service-worker.js
 
 ### Completed - Testing: