v0.6.1 Tweaks the interface for the newly introduced web version.

✅ Saving and loading features have been disabled for the web version. This is because of it saving the files to what appears to be a temporary web space and then not being able to load as when the program is reloaded the files stop existing.

✅ The tooltips for the saving and loading features now indicate to the user that they will need to use the downloadable version to save and load.

✅ The welcome screen quit button and the file menu quit button have been removed for the web version.