Improve layout

[kimanhou]

• Instructions are not always needed, they can be in a side panel.
• Board can be bigger (more accessible) as each case needs to be at least 44 x 44 px big.
• Drag & drop letters would be appreciated.
• Being able to re-order your letters could also be nice.
• Flow for discarding letters is not intuitive.
• Language is not saved, it defaults to German everytime the page is refreshed.
• Displaying the points of each letter once they are on the board could be nice