WebOS 2 Devlog #20: Updated README.md and ARCHITECTURE.md + changed properties window

I just realised I had a properties window in the OS and that was quite outdated so I changed to include some new info like the Last Modified date which updates everytime the user saves something because i added a localStorage.setItem that saves the timestamp.

I also updated the README and ARCHITECTURE files to make them sound better and to add some additional info.

Anyway, this devlog is probably the last on for this project! Hope you enjoy :)