• Handle incorrect placement of ships: off the board + overlapping a preexisting ship
• Implement an error message for each type of incorrect placement

Ships used to be able to be re-placed in new positions/orientations and represented as such to the user on the frontend; this was possible since the background-color of the user's board was first overwritten with blue before displaying the new game state with updated ship placements, which were represented with a yellow background-color.

After merging in @kbajno 's attractive #7 , this functionality has been unwittingly deprecated since displayGameState is no longer able to overwrite a background-image with a mere background-color!! The icons are transparent... now the user can theoretically fill up the board with 20 battleships' worth of ship icons even while the backend correctly reports the battleship's updated locations.

One way to fix this bug would be to replace the user board's blue background-color with a blue background-image that would essentially replace any old ship icons.

• Handle click on enemy's grid at certain coordinates
• Allow user to confirm whether to fire or scan at these coordinates
• Implement view element for the above

• Form three-column structure in HTML/CSS
• Fill out information needed in sidebars
• Implement hits/misses stats display

• Implement markers for hits
• Implement markers for misses
• Implement markers for ships