Final devlog

This is the final devlog before shipping, packed with a load of new and improved features, including but not limited to:

• a new Tutorial, introducing you into the core features
• an updated UI to ensure the grid has always the aspect ratio 1/1
• updated the symbols used on the game board to improve readability
• shareable links to community levels, like this one => “Traffic Jam”
• New levels
• And so much more …