Add new graph visuals and overhaul end screen

[vegeta897]

The Landscape Update

This is a major visual update that replaces the old "line graph" visuals with an animated, interactive, and randomly generated landscape based on how your guesses score.

The end/results screen has also been removed. Now the results and share/play buttons are integrated into the play area upon completing a puzzle.

Other player-facing changes:

• Added a Daily/Random game mode toggle in the page heading
• Added a stats import/export page, closes #14
• Made the board tiles rounder and added more layout responsiveness related to the board size
• And a bunch of other minor tweaks, mostly to styling

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